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1,038 Animals
- Ka’apor Capuchin: Cebus olivaceus kaapori
- Kaalpens Goby: Coryogalops william
- Kabili Bumblebee Goby: Brachygobius kabiliensis
- Kabobo Apalis: Apalis kaboboensis
- Kadal Shrimp: Metapenaeus dobsoni
- Kadamba: Sepia aculeata, Sepia pharaonis, Sepiella inermis
- Kadarsan’s Celebes Forest Rodent Haemaphysaline: Haemaphysalis kadarsani
- Kadavu Fantail: Rhipidura personata
- Kadavu Honeyeater: Xanthotis provocator
- Kaempfer’s Tody-Tyrant: Hemitriccus kaempferi
- Kaffir Rail: Rallus caerulescens
- Kafue Bream: Oreochromis andersonii
- Kafue Killifish: Lethrinus mahseng, Nothobranchius kafuensis
- Kafue Lechwe: Kobus leche kafuensis
- Kafue Pike: Hepsetus odoe
- Kafue Pike Characin: Hepsetus odoe
- Kagoshima Velvetfish: Morula modus, Paraploactis kagoshimensis
- Kagu: Rhynochetos jubatus
- Kahawai: Arripis georgianus, Arripis trutta, Arripis truttacea
- Kahe Point Crab: Utinomiella dimorpha
- Kaholuamano Noctuid Moth: Hypena senicula
- Kahuzi Owl-faced Monkey: Cercopithecus hamlyni kahuziensis
- Kahuzi Red Colobus: Procolobus badius lulindicus
- Kai Cicadabird: Coracina dispar
- Kai Coucal: Centropus spilopterus
- Kai Dragonet: Bathycallionymus kaianus
- Kai Soldierfish: Ostichthys kaianus
- Kai Stargazer: Uranoscopus kaianus
- Kai Stingaree: Urolophus kaianus
- Kaia’s Dragonet: Bathycallionymus kaianus
- Kaianus Lizardfish: Synodus kaianus
- Kaibab Fairy Shrimp: Branchinecta kaibabensis
- Kaibab Squirrel: Sciurus aberti kaibabensis
- kaikai: Gazza minuta
- Kaikoura Weta: Deinacrida rugosa
- Kailola’s Hardyhead: Craterocephalus kailolae
- Kaira River Prawn: Macrobrachium dayanum
- Kaiser’s Rock Rat: Aethomys kaiseri
- Kaiserihind: Teinopalpus imperialis
- Kaiwi Channel Grenadier: Nezumia propinqua
- Kaiyomaru Rattail: Caelorinchus kaiyomaru
- Kaiyomaru Whiptail: Caelorinchus kaiyomaru
- Kajika Frog: Buergeria buergeri
- Kaka: Nestor meridionalis
- Kakadu Dunnart: Sminthopsis bindi
- Kakadu Yullandria: Yullandria kakadu
- Kakapo: Strigops habroptila, Strigops habroptilus
- Kakapo Owl Parrot: Strigops habroptilus
- Kakawahie: Paroreomyza flammea
- Kakunda: Rhinomugil corsula
- Kala: Naso hexacanthus
- Kalabans: Sinilabeo dero
- Kalambo Suckermouth: Chiloglanis kalambo
- Kalbar Rasbora: Rasbora kalbarensis
- Kalbarri Balloon-winged Katydid: Tympanophora kalbarri
- Kaliformischer Tintenfisch: Loligo plei
- Kalifornisher Kalmar: Loligo opalescens
- Kalimantan Ilisha: Elliptio pusillus, Ilisha macrogaster
- Kalimantan River Sprat: Clupeoides hypselosoma
- Kalinowski Agouti: Dasyprocta kalinowskii
- Kalinowski’s Mastiff Bat: Mormopterus kalinowskii
- Kalinowski’s Mouse Opossum: Hyladelphys kalinowskii
- Kalinowski’s Mouse Opossumn: Hyladelphys kalinowskii
- Kalinowski’s Oldfield Mouse: Thomasomys kalinowskii
- Kalinowski’s Opossum: Hyladelphys kalinowskii
- Kalinowski’s Tinamou: Nothoprocta kalinowskii
- Kalirinda: Sepia aculeata, Sepiella inermis, Uroteuthis duvauceli
- Kallan Kanava: Sepia aculeata, Sepia pharaonis, Sepiella inermis
- Kallina Emperor: Doxocopa kallina
- Kalmar: Illex argentinus, Illex coindetii, Illex illecebrosus, Illex oxygonius, Loligo africana, Loligo bleekeri, Loligo forbesii, Loligo gahi, Loligo media, Loligo ocula, Loligo opalescens, Loligo pealeii, Loligo pickfordi, Loligo plei, Loligo roperi, Loligo sanpaulensis, Loligo subulata, Loligo surinamensis, Loligo vietnamensis, Loligo vulgaris reynaudi, Loligo vulgaris vulgaris, Ommastrephes bartramii
- Kalmari-Laji: Illex illecebrosus, Loligo pealeii
- Kalolo Mudskipper: Periophthalmus kalolo, Tellinella jubar
- Kaluga: Huso dauricus
- Kam Dwarf Hamster: Cricetulus kamensis
- Kama’o: Myadestes myadestinus
- Kamaka Rainbowfish: Melanotaenia kamaka
- Kamao: Myadestes myadestinus
- Kamchatcka Shrew: Sorex camtschatica
- Kamchatka Flounder: Atheresthes evermanni
- Kamchatka Salmon: Gymnocranius griceus, Oncorhynchus mykiss, Oncorhynchus mykiss stonei
- Kamchatka Shrew: Sorex camtschatica
- Kamchatka Snow Sheep: Ovis nivicola nivicola
- Kamchatka Steelhead: Gymnocranius griceus, Oncorhynchus mykiss, Oncorhynchus mykiss stonei
- Kamchatka Trophon: Trophonopsis kamchatkana
- Kamchatka Trout: Gymnocranius griceus, Oncorhynchus mykiss, Oncorhynchus mykiss stonei
- Kamchatkan Rainbow Trout: Oncorhynchus mykiss mykiss
- Kamehameha Butterfly: Vanessa tameamea
- Kamiranzovu Haplo: Haplochromis kamiranzovu
- Kamloops: Gymnocranius griceus, Oncorhynchus mykiss, Oncorhynchus mykiss stonei
- Kamloops Trout: Gymnocranius griceus, Oncorhynchus mykiss, Oncorhynchus mykiss stonei
- Kammal Thryssa: Thryssa kammalensis
- Kamohara Grenadier: Caelorinchus kamoharai
- Kamohara Whiptail: Caelorinchus kamoharai
- Kampen’s Ilisha: Ilisha kampeni
- Kampen’s Pipefish: Phoxocampus tetrophthalmus
- Kampoyo: Bagrus meridionalis
- Kanab Amber Snail: Oxyloma kanabense
- Kanab Ambersnail: Oxyloma kanabense
- Kanadi Kingfish: Scomberomorus plurilineatus
- Kanadi Seerfish: Scomberomorus plurilineatus
- Kanakorum Catshark: Aulohalaelurus kanakorum
- Kanava: Euprymna stenodactyla, Sepia aculeata, Sepia elliptica, Sepia pharaonis, Sepiella inermis
- Kanawha Darter: Etheostoma kanawhae
- Kanawha Minnow: Phenacobius teretulus
- Kanayuk: Myoxocephalus scorpioides
- Kanchil: Tragulus javanicus
- Kanda: Valamugil engeli
- Kanda Mullet: Valamugil engeli
- Kandabai: Sepiella inermis
- Kandar: Puntius lanaoensis
- Kandavai: Sepia pharaonis
- Kandavaya: Uroteuthis duvauceli
- Kanganaman Catfish: Arius solidus
- Kangaroo Hard Tick: Amblyomma triguttatum
- Kangaroo Island Dunnart: Sminthopsis aitkeni
- Kangaroo Island Echidna: Tachyglossus aculeatus, Tachyglossus aculeatus multiaculeatus
- Kangaroo Island Emu: Dromaius baudinianus
- Kangaroo Island Requena: Requena kangaroo
- Kangaroo Island Western Grey Kangaroo: Macropus fuliginosus
- Kangaroo Shrimp: Glyphus marsupialis
- Kangaroo Soft Tick: Ornithodoros gurneyi
- Kangaroo Tick: Amblyomma triguttatum
- Kansas Bog Lemming: Synaptomys cooperi paludis
- Kansas Glossy Snake: Arizona elegans elegans
- Kansas Planarian: Sphalloplana kansensis
- Kansas Well Amphipod: Bactrurus hubrichti
- Kansas Well Bactrurid: Bactrurus hubrichti
- Kansu Mole: Scapanulus oweni
- Kantaka Barb: Osteochilichthys brevidorsalis
- Kanyu: Elopichthys bambusa
- Kapenta: Limnothrissa miodon
- Kaplan’s Thestor: Thestor kaplani
- Kappe Bondas: Euprymna stenodactyla, Sepia aculeata, Sepiella inermis
- Kappe Dondas: Sepia pharaonis
- Kappie Blenny: Omobranchus woodi
- Kapuas Elegant Paradise Fish: Polynemus kapuasensis
- Kapuas River Sprat: Clupeichthys bleekeri
- Kara Tau Argali: Ovis ammon nigrimontana
- Karamoja Apalis: Apalis karamojae
- karanteen: Crenidens crenidens
- karanteen Seabream: Crenidens crenidens
- karateen Seabream: Crenidens crenidens
- Karenteen Seabream: Crenidens crenidens
- Kariba Bream: Macropharyngodon sp, Oreochromis mortimeri
- Kariba Tilapia: Macropharyngodon sp, Oreochromis mortimeri
- Karimi’s Fat-tailed Mouse Opossum: Thylamys karimii
- Karimunjawa Dottyback: Pseudochromis ransonneti
- Karnataka Labeo: Labeo calbasu, Nuculana patagonica
- Karner Blue: Lycaeides melissa, Lycaeides melissa samuelis, Plebejus melissa samuelis
- Karner Melissa Blue: Lycaeides melissa samuelis
- Karok Hesperian: Vespericola karakorum, Vespericola karokorum
- Karok Hesperion: Vespericola karokorum
- Karomo: Oreochromis karomo
- Karoo Brown Tick: Rhipicephalus follis
- Karoo Bustard: Eupodotis vigorsii
- Karoo Paralysis Tick: Ixodes rubicundus
- Karoo Thorn Mealybug: Nipaecoccus viridis
- Karrer’s Whiptail: Caelorinchus karrerae
- Karri Frog: Geocrinia rosea
- Karri Requena: Requena minya
- Karroo Cape Tortoise: Homopus femoralis
- Karup’s Sole: Boucardicus minutus, Synaptura albomaculata
- karut Croaker: Johnius carutta, Trapania aurata
- Karwinski’s Beauty: Smyrna karwinskii
- Kashgarian Loach: Triplophysa yarkandensis yarkandensis
- Kashmir Cave Bat: Myotis longipes
- Kashmir Field Mouse: Apodemus rusiges
- Kashmir Flycatcher: Ficedula subrubra
- Kashmir Flying Squirrel: Hylopetes fimbriatus
- Kashmir Haemaphysalid: Haemaphysalis kashmirensis
- Kashmir Latia: Crossocheilus diplochilus
- Kashmir Pygmy Shrew: Sorex planiceps
- Kashmir Shrew: Sorex planiceps
- Kashmir Stag: Cervus elaphus hanglu
- Kashmir Triplophysa-Loach: Triplophysa marmorata
- kashmir White-Toothed Shrew: Crocidura pullata
- Kasner’s Dwarf Burrowing Skink: Scelotes kasneri
- Katahdin Arctic: Oeneis polixenes katahdin
- Katanglad Fruit Bat: Alionycteris paucidentata
- Katapa-Tapa: Puntius flavifuscus
- Katavi Mouthbrooder: Haplochromis katavi
- Kathala Croaker: Kathala axillaris
- Katherine’s Wrasse: Cirrhilabrus katherinae
- Katinka’s Shrew: Crocidura katinka
- Katli: Neolissochilus hexagonolepis
- Katolo: Puntius katolo
- Katonkel Barracuda Kuda: Scomberomorus commerson
- Katrana: Rheocles alaotrensis
- Katy: Chaetodon capistratus, Chaetodon ocellatus, Chaetodon sedentarius
- Katydid Hunter: Sphex pennsylvanica
- Kaua’i ’amakihi: Hemignathus kauaiensis
- Kaua’i ’o’o: Moho braccatus
- Kauai ’akialoa: Akialoa stejnegeri
- Kauai ’alialoa: Hemignathus procerus
- Kauai ’elepaio: Chasiempis sandwichensis sclateri
- Kauai ’le’ie Damselfly: Megalagrion kauaiense
- Kauai ’o’o: Moho braccatus
- Kauai Amakihi: Hemignathus kauaiensis
- Kauai Band-legged Neseis Seed Bug: Neseis alternatus
- Kauai Bog Damselfly: Megalagrion paludicola
- Kauai Cave Amphipod: Spelaeorchestia koloana
- Kauai Cave Wolf Spider: Adelocosa anops
- Kauai Creeper: Oreomystis bairdi
- Kauai Flightless Stag Beetle: Apterocychus honoluluensis
- Kauai Halosaurid Fish: Aldrovandia phalacra
- Kauai Mountain Damselfly: Megalagrion heterogamias
- Kauai Nesomimesan Sphecid Wasp: Nesomimesa kauaiensis
- Kauai Nesotocus Weevil: Nesotocus kauaiensis
- Kauai Nukupu’u: Hemignathus lucidus hanapepe
- Kauai Oo: Moho braccatus
- Kauai Parti-Colored Oliarus Planthopper: Oliarus consimilis
- Kauai Thin-Footed Bush Cricket: Thaumatogryllus variegatus
- Kauai Yellow-faced Bee: Nesoprosopis kauaiensis
- Kaui Cave Amphipod: Spelaseorchestia kiloana
- Kaumana Cave Cricket: Caconemobius varius
- kaup’s Arrowtooth Eel: Synaphobranchus kaupii
- Kaup’s Sole: Boucardicus minutus, Synaptura albomaculata
- Kauri Snail: Paryphanta busbyi
- Kavirondo Barb: Barbus sexradiatus
- Kaw Whitelip: Triodopsis chadwicki, Webbhelix chadwicki
- Kawa Kawa: Euthynnus affinis
- Kawakawa: Euthynnus affinis
- Kawall’s Parrot: Amazona kawalli
- Kazakhstan Argali: Ovis ammon collium
- Kazbeg Birch Mouse: Sicista kazbegica
- Kea: Nestor notabilis
- Keanae Nesosydne Planthopper: Nesosydne sulcata
- Keays’s Rice Rat: Oryzomys keaysi
- Keel-Billed Motmot: Electron carinatum
- Keel-Billed Toucan: Ramphastos sulfuratus
- Keel-Head: Xyrichtys jacksonensis
- Keel-Jawed: Tylosurus acus melanotus
- Keel-Jawed Needle Fish: Tylosurus acus melanotus
- Keel-Scaled Earless Lizard: Holbrookia propinqua
- Keelcheek Bass: Synagrops spinosus
- Keeled Aforia: Aforia circinata
- Keeled Barrel-Bubble: Acteocina carinata, Coleophysis carinata
- Keeled Box Turtle: Cuora mouhotii
- Keeled Bullseye: Pempheris oualensis
- Keeled Clio: Styliola subula
- Keeled Cubehead: Cubiceps pauciradiatus
- Keeled Earless Lizard: Holbrookia propinqua
- Keeled Eulima: Scalenostoma babylonia
- Keeled Jumping-Slug: Hemphillia burringtoni
- Keeled Mountainsnail: Oreohelix carinifera
- Keeled Mullet: Liza carinata
- Keeled Mytilaspis: Opuntiaspis carinata
- Keeled Needlefish: Platybelone argalus argalus, Platybelone argalus platyura
- Keeled Pandora: Pandora bushiana
- Keeled Rams-Horn: Planorbella traski
- Keeled Rock Shrimp: Sicyonia disdorsalis
- Keeled Sideband: Monadenia circumcarinata
- Keeled Silverside: Iso hawaiiensis
- Keeled Solarelle: Lamellitrochus carinatus
- Keeled Sundial: Discotectonica discus
- Keeler’s Spur-Throat Grasshopper: Melanoplus keeleri, Melanoplus keeleri luridus
- Keeljawed Longton: Tylosurus acus melanotus
- Keeltail Needlefish: Platybelone argalus, Platybelone argalus annobonensis, Platybelone argalus argalus, Platybelone argalus platyura, Platybelone argalus pterura, Platybelone argalus trachura
- Keeltail Pomfret: Taractes rubescens
- Keen’s Mouse: Peromyscus keeni
- Keen’s Myotis: Myotis keenii
- Keferstein’s Sea Cucumber: Polyplectana kefersteini
- Keferstein’s Toadlet: Pseudophryne coriacea
- Kei Goby: Oligolepis keiensis
- Kei Myotis: Myotis stalkeri
- Keifer Mealybug: Spilococcus keiferi
- Keikie Scale: Leucaspis gigas
- Kekogigi: Pseudobagrus ichikawai
- Kelaart’s Long-Clawed Shrew: Feroculus feroculus
- Kelaart’s Pipistrelle: Pipistrellus ceylonicus
- Kelaart`s Dwarf Toad: Adenomus kelaartii
- Kelee: Hilsa kelee
- Kelee Shad: Hilsa kelee
- kelesa: Scleropages formosus
- Keletius Mystus: Mystus keletius
- Kellen’s Dormouse: Graphiurus kelleni
- Kellet’s Whelk: Kelletia kelleti
- Kelley’s Island Salamander: Ambystoma laterale
- Kellog’s Seahorse: Hippocampus kelloggi
- Kellogg Scale: Stramenaspis kelloggi
- Kellogg’s Rice Rat: Oryzomys kelloggi
- Kellogg’s Scorpionfish: Scorpaenodes kelloggi
- Kelly’s Cream And Brown Mottled Microcaddisfly: Oxyethira kellyi
- Kelp Bass: Paralabrax clathratus, Paralabrax clathratus
- Kelp Clingfish: Rimicola muscarum
- Kelp Crab: Pugettia gracilis, Pugettia producta
- Kelp Fish: Chironemus georgianus
- Kelp Goby: Lethops connectens
- Kelp Goose: Chloephaga hybrida
- Kelp Greenling: Hexagrammos decagrammus, Tricomya hirsuta
- Kelp Grouper: Epinephelus bruneus
- Kelp Gull: Larus dominicanus
- Kelp Gunnel: Apodichthys sanctaerosae
- Kelp Humpback Shrimp: Hippolyte clarki
- Kelp Klipfish: Clinus rotundifrons
- Kelp Perch: Brachyistius frenatus
- Kelp Petricolid: Petricola hertzana
- Kelp Pipefish: Syngnathus californiensis, Syngnathus californiensis leptorhynchus
- Kelp Poacher: Agonomalus mozinoi
- Kelp Rockfish: Sebastes atrovirens
- Kelp Scallop: Leptopecten latiauratus
- Kelp Sculpin: Sigmistes caulias, Sigmistes smithi
- Kelp Sea Perch: Lutjanus bohar
- Kelp Seaperch: Brachyistius frenatus
- Kelp Snailfish: Liparis tunicatus
- Kelp Visored Shrimp: Betaeus gracilis
- Kelp Weedfish: Heteroclinus eckloniae
- Kelpfish: Chironemus marmoratus
- kelpie: Notolabrus fucicola
- Kelsey Corbula: Corbula kelseyi
- Kelsey Datemussel: Lithophaga plumula
- Kelsey Pouch-Clam: Milneria kelseyi
- Kelsey Pouchclam: Milneria kelseyi
- Kelso Dune Glaresis Scarab Beetle: Glaresis arenata
- Kelso Giant Sand Treader Cricket: Macrobaenetes kelsoensis
- Kelso Jerusalem Cricket: Ammopelmatus kelsoensis
- Kelt: Salmo salar, Salmo salar relictus
- Kemp Garra: Garra kempi
- Kemp’s Gerbil: Tatera kempi
- Kemp’s Grass Mouse: Akodon kempi
- Kemp’s Ridley: Lepidochelys kempii
- Kemp’s Ridley Sea Turtle: Lepidochelys kempii
- Kemp’s Spiny Mouse: Acomys kempi
- Kemp’s Thicket Rat: Thamnomys kempi
- Kempton Eriococcin: Eriococcus kemptoni
- Kemujan Long-tailed Macaque: Macaca fascicularis karimondjawae
- Kenai Black Bear: Ursus americanus perniger
- Kenai Dall Sheep: Ovis dalli, Ovis dalli kenaiensis
- Kenai Wolverine: Gulo gulo katschemakensis
- Kendal’s Satyr: Splendeuptychia kendalii
- Kendall Warm Springs Dace: Rhinichthys osculus thermalis
- Kendall’s Giant Skipper: Megathymus yuccae kendalli
- Kenicott’s Beringius: Beringius kenicottii
- Kennedy’s Emerald: Somatochlora kennedyi
- Kennel Tick: Rhipicephalus sanguineus
- Kennerley Venus: Humilaria kennerleyi
- Kennerley’s Venus: Humilaria kennerleyi
- kennerly’s Salmon: Oncorhynchus nerka
- Kenneth’s Blue Metalmark: Lasaia kennethi
- Kenneth’s White-Toothed Rat: Berylmys mackenziei
- Kennicott’s Neptune: Beringion kennicottii
- Kennicott’s Spur-Throat Grasshopper: Melanoplus kennicotti
- Kent’s Geometer: Sebastosema bubonaria
- Kentia Mealybug: Nipaecoccus nipae
- Kentish Gardensnail: Monacha cantiana
- Kentish Plover: Charadrius alexandrinus
- Kentucky Cave Shrimp: Palaemonias ganteri
- Kentucky Crayfish: Orconectes kentuckiensis
- Kentucky Creekshell: Villosa ortmanni
- Kentucky Darter: Etheostoma rafinesquei, Etheostoma rafinesqueiin
- Kentucky Lichen Moth: Cisthene kentuckiensis
- Kentucky Red-Backed Vole: Clethrionomys gapperi maurus
- Kentucky Salamander: Plethodon kentucki
- Kentucky Slitmouth: Stenotrema angellum
- Kentucky Snubnose Darter: Etheostoma rafinesquei
- Kentucky Spring Salamander: Gyrinophilus porphyriticus, Gyrinophilus porphyriticus duryi
- Kentucky Warbler: Oporornis formosus
- Kentuky Red-Backed Vole: Clethrionomys gapperi maurus
- Kenya Oribi: Ourebia ourebi kenyae
- Kenya Star: Choriaster granulatus
- Kenyan African Mole Rat: Tachyoryctes ibeanus
- Kenyan Big-Eared Free-Tailed Bat: Tadarida lobata
- Kenyan Chromis: Chromis nigroanalis
- Kenyan Lungfish: Protopterus amphibius
- Kenyan Wattled Bat: Chalinolobus kenyacola, Glauconycteris kenyacola
- Kenyi Cichlid: Pseudotropheus lombardoi
- Keoghfish: Ophichthus rex
- Keppi: Sarotherodon lohbergeri
- Kerala Mystus: Mystus armatus
- Kerala Rat: Rattus ranjiniae
- Kerama Deer: Cervus nippon keramae
- Kerch Black Sea Shad: Alosa pontica
- Kerch Shad: Alosa pontica
- Kerea Satyr: Taygetis kerea
- Kerguelen Fur Seal: Arctocephalus gazella
- Kerguelen Petrel: Lugensa brevirostris
- Kerguelen Sandpaper Skate: Bathyraja irrasa
- Kerguelen Shag: Phalacrocorax verrucosus
- Kerguelen Spiny Plunderfish: Harpagifer kerguelensis
- Kerguelen Tern: Sterna virgata
- Kermadec Petrel: Pterodroma neglecta
- Kermadec Rattail: Caelorinchus kermadecus
- Kermadec Scalyfin: Parma kermadecensis
- Kermadec Triplefin: Enneapterygius kermadecensis
- Kermes Berry: Kermes quercus, Kermes vermilio
- Kermes Scale: Allokermes gillettei
- Kermode Black Bear: Ursus americanus kermodei
- Kern Brook Lamprey: Entosphenus hubbsi
- Kern Canyon Slender Salamander: Batrachoseps simatus
- Kern Golden Trout: Oncorhynchus mykiss gilberti
- Kern Plateau Salamander: Batrachoseps robustus
- Kern Plateau Slender Salamander: Batrachoseps robustus
- Kern Primrose Sphinx: Euproserpinus euterpe
- Kern River Golden Trout: Oncorhynchus mykiss, Oncorhynchus mykiss gilberti
- Kern River Pyrg: Pyrgulopsis greggi
- Kern Shoulderband: Helminthoglypta callistoderma
- Kernel Chalice-Bubble: Cylichna nucleolus
- Kerr’s Agrotis Noctuid Moth: Agrotis ipsilon, Agrotis kerri
- Kerr’s Danio: Danio kerri
- Kerr’s Noctuid Moth: Agrotis ipsilon, Agrotis kerri
- Kerrer’s Whiptail: Caelorinchus karrerae
- Kerry Slug: Geomalacus maculosus
- kersten’s Barb: Barbus kerstenii, Barbus kerstenii kerstenii
- Kerten’s Barb: Barbus kerstenii kerstenii
- Kessler’s Goby: Neogobius kessleri
- Kessler’s Gudgeon: Romanogobio kesslerii
- Kessler’s Loach: Schistura kessleri
- Kessler’s Sculpin: Leocottus kesslerii
- Kestrel: Falco tinnunculus
- Keta: Oncorhynchus keta
- Keta Salmon: Oncorhynchus keta
- Kete: Chaetodon capistratus
- Kew Bug: Insignorthezia insignis
- Key Anchovy: Anchoa cayorum
- Key Blenny: Starksia starcki
- Key Brotula: Ogilbia cayorum
- Key Deer: Odocoileus virginianus clavium
- Key Deer Toy Deer: Odocoileus virginianus clavium
- Key Gnaphosid Spider: Cesonia irvingi
- Key Goby: Drombus key
- Key Largo Cotton Mouse: Peromyscus gossypinus allapaticola
- Key Largo Woodrat: Neotoma floridana smalli
- Key Ringneck Snake: Diadophis punctatus acricus
- key Sardine: Jenkinsia lamprotaenia
- Key Silverside: Menidia conchorum
- Key Vaca Raccoon: Procyon lotor auspicatus
- Key West Cyclostreme: Cyclostrema huesonicum
- Key West Latirus: Teralatirus cayohuesonicus
- Key West Quail-Dove: Geotrygon chrysia
- Key West Raccoon: Procyon lotor incautus
- Key Worm Eel: Ahlia egmontis
- Keyhole: Cleithracara maronii
- Keyhole Angelfish: Centropyge tibicen
- Keyhole Cichlid: Cleithracara maronii, Cleithracara maronii¦
- Keyhole Wasp: Pachodynerus nasidens
- Keys Bush Cricket: Orocharis diplastes
- Keys Mudcloak: Hojeda inaguensis
- Keys Scaly Cricket: Cycloptilum irregularis
- Keys Sealy Cricket: Cycloptilum irregularis
- Keys Short-Winged Conehead Katydid: Belocephalus sleighti
- Keys Simnia: Neosimnia spelta, Neosimnia spelta capitia
- Keys Topsnail: Calliostoma adelae
- Keys Vertigo: Vertigo hebardi
- Keys Wood Cricket: Gryllus cayensis
- Kha-nyou: Laonastes aenigmamus
- Khadary Whitefish: Coregonus chadary
- Khadary-Whitefish: Coregonus chadary
- Khagga: Arius thalassinus
- Khajuria’s Leaf-Nosed Bat: Hipposideros durgadasi
- Khaki Flounder: Laeops kitaharae, Laeops natalensis, Platycoelus poeciloides
- Khaki Grunter: Hephaestus tulliensis
- Khandalla Minnow: Boucardicus inconspicuus, Parapsilorhynchus tentaculatus
- Khanka Gudgeon: Squalidus chankaensis chankaensis
- Khanka Spiny Bitterling: Acanthorhodeus chankaensis, Neopetraeus tessellatus
- Khapra Beetle: Trogoderma granarium
- Khartoum Gerbil: Gerbillus stigmonyx
- Khasi Garra: Garra lissorhynchus, Garra nasuta
- Khavalchor Catfish: Neotropius khavalchor
- Khavli Barb: Puntius sahyadriensis
- Khiva Loach: Dzihunia amudarjensis
- Khorezm Loach: Dzihunia amudarjensis
- Khting Vor: Pseudonovibos spiralis
- Khudree Mahseer: Tor khudree
- Kiack: Alosa pseudoharengus
- Kiamichi Crayfish: Orconectes saxatilis
- Kiamichi Shiner: Notropis ortenburgeri
- Kiamichi Slimy Salamander: Plethodon kiamichi
- Kiamichi Willowfly: Strophopteryx cucullata
- Kian Sole: Aseraggodes kaianus
- Kiang: Equus kiang
- Kianichi Slimy Salamander: Plethodon kiamichi
- Kiark-Varrey: Cyclopterus lumpus
- Kiawe Flower Moth: Ithome concolorella
- Kiawe Scolytid: Hypothenemus birmanus
- Kibiti Lampeye: Aplocheilichthys lacustris
- Kibonde: Chrysichthys brachynema
- kickininee: Oncorhynchus nerka
- Kiddi Shrimp: Parapenaeopsis stylifera
- Kidney-Headed Shark: Sphyrna lewini
- Kidney-Spot Ladybird Beetle: Chilocorus renipustulatus
- Kidneybean Thracia: Thracia phaseolina, Thracia “phaseolina
- Kidneyshell: Ptychobranchus fasciolaris
- Kiener’s Silverside: Teramulus kieneri
- Kihaule’s Mouse Shrew: Myosorex kihaulei
- Kikado Moray: Gymnothorax kidako
- Kikambala Nothobranch: Nothobranchius interruptus
- Kikuyu White-Eye: Zosterops poliogaster
- Kikuzato’s Brook Snake: Opisthotropis kikuzatoi
- Kil’din Cod: Gadus morhua
- Kilangmiutak Collared Lemming: Dicrostonyx kilangmiutak
- Kildeer Plover: Charadrius vociferus
- Kilimanjaro Giraffe: Giraffa camelopardalis tippelskirchi
- Kilimanjaro Mouse Shrew: Myosorex zinki
- Kilimanjaro Shrew: Crocidura monax
- Kilimanjaro Swallowtail: Papilio sjoestedti
- Kilka: Clupeonella cultriventris
- Killarney Shad: Alosa fallax, Alosa fallax fallax, Alosa fallax nilotica
- Killdeer: Charadrius vociferous, Charadrius vociferus, Charadrius vociferus vociferus
- Killer Whale: Orcinus orca
- Killie: Aplocheilus panchax, Aplocheilus panchax siamensis
- Killifish: Austrolebias adloffi, Austrolebias affinis, Austrolebias alexandri, Austrolebias bellottii, Austrolebias cinereus, Austrolebias gymnoventris, Austrolebias luteoflammulatus, Austrolebias melanoorus, Austrolebias nigripinnis, Austrolebias nioni, Austrolebias vazferreirai, Austrolebias viarius, Cynopoecilus melanotaenia, Fundulus confluentus, Fundulus heteroclitus heteroclitus, Fundulus lima, Fundulus majalis, Megalebias cheradophilus, Megalebias prognathus, Megalebias wolterstorffi, Micropanchax johnstoni
- Kilombero Weaver: Ploceus burnieri
- Kim’s Requena: Requena kimi
- Kimberley Blenny: Cirripectes alleni
- Kimberley Catfish: Paraplotosus muelleri
- Kimberley Grunter: Syncomistes kimberleyensis
- Kimberley Mogurnda: Mogurnda oligolepis
- Kimberley Spangled Perch: Leiopotherapon macrolepis
- Kimberly Mouse: Pseudomys laborifex
- Kimberly Rock Rat: Zyzomys woodwardi
- Kinabalu Serpent-Eagle: Spilornis kinabaluensis
- Kinabalu Shrew: Crocidura baluensis
- Kinabalu Squirrel: Callosciurus baluensis
- Kinavalli: Octopus globosus
- Kincaid Coastal Shrimp: Heptacarpus kincaidi
- Kincaid Meadow Vole: Microtus pennsylvanicus kincaidi
- Kindia Killi: Scriptaphyosemion cauveti
- king: Oncorhynchus tshawytscha
- King Amberjack: Seriola lalandi
- King Angelfish: Holacanthus passer
- King Arboreal Rice Rat: Oecomys rex
- king Barracouta: Rexea solandri, Zebina lata
- king Barracuda: Rexea solandri, Zebina lata
- King Colobus: Colobus polykomos
- King Coscarob: Polycentrus schomburgkii
- king Couta: Rexea solandri, Zebina lata
- King Crab: Paralithodes camtschaticus
- King Croaker: Genyonemus lineatus
- King Demoiselle: Chrysiptera rex
- King Dory: Cyttus traversi
- King Eider: Somateria spectabilis
- King Fish: Caranx hippos, Eleutheronema tetradactylum, Gnathanodon speciosus, Megalaspis cordyla
- King Flathead: Platycephalus richardsoni, Platycephalus speculator
- King Gar: Scomberesox saurus scombroides
- King George Spring Heath: Erica carnea ’King George’
- king George Whiting: Sillaginodes punctatus
- King Gull: Larus hartlaubii
- King Gumleaf Katydid: Terpandrus cabon
- King Horseshoe Bat: Rhinolophus rex
- King Island Emu: Dromaius ater
- King Jird: Meriones rex
- King Mackerel: Scomberomorus cavalla, Scomberomorus commerson
- King Mole Rat: Tachyoryctes rex
- King Mullet: Mulloidichthys martinicus
- King of Herrings: Regalecus glesne
- King of the Breams: Pagellus erythrinus
- King of the Herring: Chimaera monstrosa, Regalecus glesne
- King of the Mullets: Apogon imberbis, Dicentrarchus labrax
- king Parrotfish: Scarus flavipectoralis
- King Penguin: Aptenodytes patagonica, Aptenodytes patagonicus
- King Rail: Rallus elegans, Rallus elegans elegans
- King Rat: Uromys rex
- king Salmon: Oncorhynchus tshawytscha, Polydactylus macrochir
- King Seer: Scomberomorus commerson
- King Snake Eel: Ophichthus rex
- King Snapper: Centroberyx gerrardi, Lutjanus sebae, Pristipomoides filamentosus
- King Soldier Bream: Argyrops spinifer
- King Soldierbream: Argyrops spinifer
- King Threadfin: Polydactylus macrochir
- King Venus: Chione cingenda
- King Vulture: Sarcoramphus papa, Sarcorhamphus papa
- king Weakfish: Macrodon ancylodon
- King’s Bullhead: Liobagrus kingi
- King’s Cream and Brown Mottled Microcaddisfly: Oxyethira kingi
- King’s Creek Ecclisomyian Caddisfly: Ecclisomyia bilera
- King’s Creek Parapsyche Caddisfly: Parapsyche extensa
- King’s Hairstreak: Satyrium kingi
- King-Fish: Genyonemus lineatus
- King-Of-The-Salmon: Trachipterus altivelis
- Kingclip: Genypterus blacodes
- Kingfish: Acanthocybium solandri, Argyrosomus japonicus, Caesiosoma aequipinnis, Carangoides malabaricus, Caranx hippos, Genyonemus lineatus, Lampris guttatus, Menticirrhus americanus, Menticirrhus littoralis, Menticirrhus saxatilis, Menticirrhus undulatus, Rachycentron canadum, Rexea solandri, Scomberomorus cavalla, Scomberomorus commerson, Seriola lalandi, Zebina lata
- Kingfish Mackerel: Scomberomorus regalis
- Kingfisher: Mergaceryle torquata
- Kingie: Seriola lalandi
- Kingklip: Anoma dohrniana, Genypterus blacodes, Genypterus capensis, Genypterus chilensis, Genypterus maculatus
- Kinglet Calyptura: Calyptura cristata
- Kinglet Rock Shrimp: Sicyonia typica
- Kingly Toothshell: Polyschides pandionis
- Kingman Springsnail: Pyrgulopsis conica
- Kings Canyon Cryptochian Caddisfly: Cryptochia excella
- Kings River Pyrg: Pyrgulopsis imperialis
- Kings River Slender Salamander: Batrachoseps regius
- Kings Shoulderband: Helminthoglypta ferrissi
- Kingsley’s Ctenopoma: Ctenopoma kingsleyae
- Kingston: Decapterus macarellus, Decapterus tabl
- Kingston Mountain Chipmunk: Tamias panamintinus acrus
- Kingston Oregonian: Cryptomastix sanburni
- kingy: Argyrosomus japonicus
- Kinkajou: Potos flavus
- Kinnaur Snowtrout: Schizopygopsis stoliczkai
- Kinneret Bleak: Acanthobrama terraesanctae
- Kintampo Rope Squirrel: Funisciurus substriatus
- Kioea: Chaetoptila angustipluma
- Kioloides Rail: Canirallus kioloides
- Kiowa Dancer: Argia immunda
- Kipengere Seedeater: Serinus melanochrous
- Kipper: Clupea harengus harengus
- Kipper Herring: Clupea harengus harengus
- kippered Salmon: Oncorhynchus tshawytscha
- Kirby’s Backswimmer: Notonecta kirbyi
- Kirby’s Tiger: Parantica kirbyi
- Kirgis Comma Scale: Lepidosaphes malicola
- Kirikuchi Char: Salvelinus japonicus
- Kiritchenko’s Felt Scale: Eriococcus cingulatus
- Kirk’s Blenny: Alticus kirkii
- Kirk’s Dik-Dik: Madoqua kirkii, Madoqua kirkii cavendishi
- Kirk’s Nothobranch: Nothobranchius kirki
- Kirk’s Red Colobus: Procolobus kirkii
- Kirkaldy’s White Fly: Dialeurodes kirkaldyi
- Kirtland’s Snake: Clonophis kirtlandii
- Kirtland’s Warbler: Dendroica kirtlandii
- Kirtland’s Wood Warbler: Dendroica kirtlandii
- Kisangani Red Colobus: Procolobus badius langi
- Kishi Velvet Shrimp: Metapenaeopsis dalei
- Kishinoue’s Giant Skink: Plestiodon kishinouyei
- Kiska Winter Wren: Troglodytes troglodytes kiskensis
- Kisolo Toad: Bufo kisoloensis
- Kissing Damsel: Cheiloprion labiatus
- Kissing Gourami: Cymatium lesueuri, Helostoma temminkii
- Kissing Loach: Leptobotia curta
- Kissing Prochilodus: Nodulus nyssus, Semaprochilodus insignis
- Kisslip Cuttlefish: Sepia lycidas
- kit: Dasyatis americana
- Kit Fox: Vulpes macrotis, Vulpes macrotis macrotis, Vulpes macrotis mutica
- Kitaoka’s Japanese Primitive Haemaphysalid: Haemaphysalis kitaokai
- Kitchener’s Ningaui: Ningaui yvonneae
- Kite Ray: Myliobatis tobijei
- Kite’s Neotrichian Caddsifly: Neotrichia kitae
- Kite-Fin Shark: Oxynotus paradoxus
- Kitefin Shark: Dalatias licha
- Kitefish: Monodactylus argenteus
- Kitt Peak Talussnail: Sonorella xanthenes
- Kittlitz’s Murrelet: Brachyramphus brevirostris
- Kittlitz’s Plover: Charadrius pecuarius
- kitty Mitchell: Epinephelus drummondhayi
- Kivu Climbing Mouse: Dendromus kivu
- Kivu Ground-Thrush: Zoothera tanganjicae
- Kivu Long-Haired Shrew: Crocidura lanosa
- Kivu Shrew: Crocidura kivuana
- Kiwi Tick: Ixodes anatis
- Kiyi: Coregonus kiyi
- Kizilagach Herring: Caspialosa curensis
- Klaas’s Cuckoo: Chrysococcyx klaas
- Klages’s Antwren: Myrmotherula klagesi
- Klamath Hesperian: Vespericola klamathicus
- Klamath Lake Sculpin: Cottus princeps
- Klamath Lamprey: Lampetra richardsoni, Lampetra similis
- Klamath Largescale Sucker: Catostomus snyderi
- Klamath Limnephilan Caddisfly: Limnephilus alconura
- Klamath Rams-Horn: Vorticifex klamathensis klamathensis
- Klamath River Lamprey: Lampetra similis
- Klamath Sideband: Monadenia churchi
- Klamath Smallscale Sucker: Catostomus rimiculus
- Klamath Weed Beetle: Chrysolina hyperici, Chrysolina quadrigemina
- Klauber’s Dwarf Gecko: Sphaerodactylus klauberi
- Klausewitz’ Garden Eel: Gorgasia klausewitzi
- Klein’s Butterfly: Chaetodon kleinii
- Klein’s Butterflyfish: Chaetodon kleinii
- Klein’s Coralfish: Chaetodon kleinii
- Klein’s Sole: Synapturichthys kleinii
- Kleine Sprutte: Sepiola affinis, Sepiola atlantica, Sepiola aurantiaca, Sepiola birostrata, Sepiola intermedia, Sepiola knudseni, Sepiola ligulata, Sepiola parva, Sepiola robusta, Sepiola rondeleti, Sepiola rossiaeformis, Sepiola steenstrupiana, Sepiola trirostrata
- klip Barbel: Austroglanis gilli
- Klipspringer: Oreotragus oreotragus, Oreotragus oreotragus stevensoni
- Klondyked Herring: Clupea harengus harengus
- Kloss Squirrel: Callosciurus albescens
- Kloss’ Gibbon: Hylobates klossii
- Kloss’s Gibbon: Hylobates klossii
- Kloss’s Mole: Euroscaptor klossi
- Kluane Sulphur: Colias christina kluanensis
- Kluchor Birch Mouse: Sicista kluchorica
- Klug’s Clearwing: Dircenna klugii
- Klunzinger’s Bullseye: Pempheris klunzingeri
- Klunzinger’s Emperor: Lethrinus xanthochilus
- Klunzinger’s Mullet: Liza klunzingeri
- Klunzinger’s Wrasse: Thalassoma rueppellii
- Knapweed Peacock Fly: Chaetorellia acrolophi
- Knapweed Root Weevil: Cyphocleonus achates
- Knapweed Seedhead Moth: Metzneria paucipunctella
- Knave Marginella: Prunum torticulum
- Kneecap Lanx: Lanx patelloides
- Kner’s Goby: Pomatoschistus knerii
- Kner’s Wrasse: Halichoeres nigrescens
- Knife: Pelecus cultratus
- Knife Fish: Chitala chitala, Gymnotus pedanopterus
- Knife Livebearer: Alfaro cultratus
- Knife Mussel: Musculus cultellus
- Knife Razorfish: Cymolutes praetextatus
- Knife Shrimp: Haliporoides triarthrus
- Knife Wrasse: Cymolutes praetextatus
- Knife-Back Seabream: Polyamblyodon gibbosum
- Knife-Footed Frog: Cyclorana cultripes
- Knife-Nosed Chimaera: Rhinochimaera atlantica, Timoclea hizenensis
- Knife-Snouted Pipefish: Hypselognathus rostratus
- Knifefish: Brachyhypopomus occidentalis, Gymnotus maculosus
- Knifejaw: Oplegnathus woodwardi
- Knifenose Chimaera: Rhinochimaera atlantica, Timoclea hizenensis
- Knifetooth Dogfish: Scymnodon ringens, Turbonilla angustissima
- Knifetooth Sawfish: Anoxypristis cuspidata
- Knight Anole: Anolis equestris
- Knight Fish: Cleidopus gloriamaris, Monocentris japonica
- Knight Rock Shrimp: Sicyonia lancifera
- Knight’s Dottyback: Kaliella elata, Pseudoplesiops knighti
- Knightfish: Cleidopus gloriamaris
- Knipowitsch’s Tadpole: Careproctus knipowitschi
- Knob Coral: Favia gravida, Favia leptophylla
- Knob Mudalia: Leptoxis minor
- Knob-Billed Fruit-Dove: Ptilinopus insolitus
- Knob-Lip Fairy Shrimp: Eubranchipus bundyi
- Knobbed Argonaut: Argonauta nodosa
- Knobbed Hornbill: Aceros cassidix
- Knobbed Mud Crab: Hexapanopeus paulensis
- Knobbed Porgy: Calamus nodosus
- Knobbed Salmonfly: Pteronarcys biloba
- Knobbed Spiny Crab: Rochinia umbonata
- Knobbed Triton: Cymatium muricinum
- Knobbed Trophon: Acanthotrophon striatoides
- Knobbed Whelk: Busycon carica
- Knobbly Sea Star: Protoreaster nodosus
- Knobby Ancylid: Rhodacme hinkleyi
- Knobby Argonaut: Argonauta nodosa, Argonauta nodosus
- Knobby Brain Coral: Diploria clivosa
- Knobby Cactus Coral: Mycetophyllia aliciae
- Knobby Candelabra: Eunicea asperula, Eunicea clavigera
- Knobby Coral: Porites rus
- Knobby Elimia: Elimia athearni
- Knobby Finger Coral: Porites duerdeni
- Knobby Flathead: Sorsogona tuberculata
- Knobby Keyhole Limpet: Fissurella nodosa
- Knobby Rocksnail: Lithasia curta
- Knobby Scallop: Caribachlamys imbricata
- Knobby Seahorse: Hippocampus breviceps
- Knobby Zoanthid: Palythoa mammillosa
- Knobbyhand Hermit: Pagurus confragosus
- Knobchin Goby: Gobiosoma nudum
- Knobel’s Riffle Beetle: Stenelmis knobeli
- Knobknee Crestleg Crab: Lophopanopeus leucomanus
- Knobkneed Crestleg Crab: Lophopanopeus leucomanus
- Knobsnout Parrotfish: Lithobius atticus, Scarus ovifrons
- Knobtooth Prawn: Macrobrachium mammillodactylus
- knock Beetle: Xestobium rufovillosum
- Knopp’s Shark: Carcharhinus altimus
- Knopper Gall: Andricus quercuscalicis
- Knotfinger Mud Crab: Panopeus lacustris
- Knothead Parrotfish: Chlorurus oedema
- Knotted Liomera: Liomera supernodosa
- Knotted Thread Hydroid: Obelia geniculata
- Knotty Elimia: Elimia interrupta
- Knotty Pebblesnail: Somatogyrus constrictus
- Knout Goby: Mesogobius batrachocephalus
- Knox Shipworm: Nototeredo knoxi
- Knoxville Hydroptilan Micro Caddisfly: Hydroptila decia
- Knysna Dwarfgoby: Pandaka silvana
- Knysna Halfbeak: Hyporhamphus capensis
- Knysna Sandgoby: Psammogobius knysnaensis, Vanderhorstia ambonaro
- Knysna Scrub-Warbler: Bradypterus sylvaticus
- Knysna Seahorse: Hippocampus capensis
- Knysna Spiny Reed Frog: Afrixalus knysnae
- Knysna Turaco: Tauraco corythaix
- Knysna Velvet Worm: Peripatopsis clavigera
- Knysna Woodpecker: Campethera notata
- Ko’olau Giant Looper Moth: Scotorythra nesiotes
- Ko’olau Spurwing Long-Legged Fly: Campsicnemus mirabilis
- Ko-Ayu: Plecoglossus altivelis altivelis
- Koa Moth: Scotorythra paludicola
- Koa Sheild Bug: Coleotichus blackburniae
- Koa Yellow-faced Bee: Nesoprosopis koae
- Koala: Phascolarctos cinereus
- Koaro: Galaxias brevipinnis
- Kob: Argyrosomus hololepidotus, Argyrosomus japonicus, Kobus kob
- Kobayashi’s Serotine: Eptesicus kobayashii
- Kobe Flounder: Crossorhombus kobensis
- Kobe Mole: Mogera wogura
- Kobi Cuttlefish: Sepia kobiensis
- Kobi Squid: Loliolus sumatrensis
- Kocevje Subterranean Spider: Troglohyphantes gracilis, Troglohyphantes similis, Troglohyphantes spinipes
- Koch’s Pitta: Pitta kochi
- Kocha Garua: Clupisoma montana
- Kochi Filefish: Paramonacanthus nipponensis
- Kodiac Parnassius: Parnassius phoebus apricatus
- Kodiak Brown Bear: Ursus arctos middendorffi
- Kodiak Ground Squirrel: Spermophilus parryii kodiacensis
- Kodiak Island Arctic Ground Squirrel: Spermophilus parryii kodiacensis
- Kodiak Island Ermine: Mustela erminea kadiacensis
- Kodiak Ringlet: Coenonympha tullia kodiak
- Kodiak River Otter: Lontra canadensis kodiacensis
- Kodiak Whelk: Buccinum kadiakense
- Kodiak Winter Wren: Troglodytes troglodytes helleri
- Koebele’s Desert Long-Horned Grasshopper: Tanaocerus koebelei
- Koebele’s Grasshopper: Trimerotropis koebelei
- Koefoed’s Searsid: Nassarius deshayesii
- Koefoed’s Smooth-Head: Bathytroctes macrolepis
- Koehne Holly: Centrolene ilex
- Koel: Eudynamis scolopacea
- Koele Mountain Damselfly: Megalagrion koelense
- Koepcke’s Hermit: Phaethornis koepckeae
- Koepcke’s Screech-Owl: Megascops koepckeae
- Koester: Acanthistius sebastoides
- Kofiau Paradise-Kingfisher: Tanysiptera ellioti
- Koford’s Grass Mouse: Akodon kofordi
- Kohchang Frog: Limnonectes kohchangae
- Koheru: Decapterus koheru
- Kohl’s Jordanian Sheep and Goat Boophilid: Rhipicephalus kohlsi
- Kohl’s Seabird Tick: Ixodes kohlsi
- Kohler’s Fritillary: Boloria selene sabulocollis
- Koi: Cyprinus carpio, Cyprinus carpio carpio
- Koiro: Conger verreauxi
- Kokako: Callaeas cinerea, Callaeas cinereus
- kokanee: Oncorhynchus nerka
- Koklass Pheasant: Pucrasia macrolopha
- Kokoda Glass Perchlet: Tetracentrum caudovittatus
- Kokoda Mogurnda: Mogurnda lineata
- Kokoda Perchlet: Tetracentrum caudovittatus
- Kokuni: Chrysichthys cranchii
- Kolakalivinda: Uroteuthis duvauceli
- Kolan Vole: Eothenomys inez
- Kolar Leaf-nosed Bat: Hipposideros hypophyllus
- Kolibri Shrimp: Solenocera agassizii
- Koloa: Anas wyvilliana
- Kolombangara Monarch: Monarcha browni
- Kolombatovic’s Goby: Chromogobius zebratus
- Kolus: Hypselobarbus kolus
- Komitichanchulu: Sepia aculeata, Sepiella inermis
- Komodo Cardinalfish: Apogon komodoensis
- Komodo Dragon: Varanus komodoensis
- Komodo Island Monitor: Varanus komodoensis
- Komodo Monitor: Varanus komodoensis
- Komodo Rat: Komodomys rintjanus
- Komosinska’s Mealybug: Trionymus phalaridis
- Kona Crab: Ranina ranina
- Kona Giant Looper Moth: Scopula junctaria, Scotorythra megalophylla
- Kona Grosbeak: Chloridops kona
- Kona Yellow-faced Bee: Nesoprosopis kona
- Kondana Soft-Furred Rat: Millardia kondana
- Kondavai: Uroteuthis duvauceli
- Kondo Mealybug: Rhizoecus kondonis
- Kongana Shrew: Sylvisorex konganensis
- Kongoni: Alcelaphus buselaphus
- Kongoro Lampeye: Aplocheilichthys kongoranensis
- Koningsberger’s Herring: Herklotsichthys koningsbergeri
- Konoshiro Gizzard Shad: Konosirus punctatus
- Konoshiru Gizzard Shad: Konosirus punctatus
- Konti Barb: Osteochilus thomassi
- Konye: Konia eisentrauti
- Konza Prairie Mayfly: Leptophlebia konza
- Kookaburra: Dacelo novaeguineae
- Kooli Barb: Puntius vittatus
- Koon: Epinephelus guttatus
- Koonthal: Sepioteuthis lessoniana, Uroteuthis duvauceli, Uroteuthis sibogae, Uroteuthis singhalensis
- Koopman’s Pencil-Tailed Tree Mouse: Chiropodomys karlkoopmani
- Koopman’s Pipistrelle: Pipistrellus westralis
- Koopman’s Porcupine: Coendou koopmani
- Koopman’s Rat: Rattus koopmani
- Kops’ Tonguesole: Cynoglossus kopsii
- Kopstein’s Emoia: Emoia jakati
- Kopstein’s Skink: Emoia jakati
- Koragu Tank Goby: Glossogobius koragensis
- Koran Angelfish: Pomacanthus semicirculatus
- Korat Supple Skink: Lygosoma koratense
- Korean Crevice Salamander: Karsenia koreana
- Korean Field Mouse: Apodemus peninsulae
- Korean Flounder: Glyptocephalus stelleri
- Korean Hare: Lepus coreanus
- Korean Lamprey: Lampetra morii
- Korean Mackerel: Elseya bellii, Scomberomorus koreanus, Scomberomorus semifasciatus
- Korean Sandeel: Hypoptychus dybowskii
- Korean Sandlance: Hypoptychus dybowskii
- Korean Seerfish: Scomberomorus koreanus
- Korean Sharpbelly: Hemiculter leucisculus, Obeliscus sallianus
- Korean Skate: Raja koreana
- Korean Stumpy Bullhead: Pseudobagrus brevicorpus
- Korean- Seerfish: Scomberomorus koreanus
- Koret’s Checkerspot: Euphydryas editha koreti
- Korhi Barb: Hypselobarbus micropogon
- Kori Bustard: Ardeotis kori
- Korinch’s Rat: Rattus korinchi
- Korogwe Tilapia: Oreochromis korogwe
- korokoro: Synodontis zambezensis
- Koros Shrimp: Atya pilipes
- Korrigum: Damaliscus lunatus korrigum
- Korsischer Feuersalamander: Salamandra corsica
- Kortvinpijlinktvis: Illex illecebrosus
- Korua Granadier Anchovy: Coilia reynaldi
- Korua Grenadier Anchovy: Coilia reynaldi
- Kosatka Gertsenshteina: Pseudobagrus herzensteini
- Kosi Hara: Hara hara
- Kosi Nangra: Nangra nangra
- Kosi Rockskipper: Patiriella occidens, Pereulixia kosiensis
- Koslov’s Pika: Ochotona koslowi
- Koslov’s Pygmy Jerboa: Salpingotus kozlovi
- Kosogol Grayling: Thymallus nigrescens
- Kosrae Crake: Porzana monasa
- Kosrae Mountain Starling: Aplonis corvina
- Kosrae Rail: Porzana monasa
- Kosrae Starling: Aplonis corvina
- Koster’s Springsnail: Juturnia kosteri
- Koster’s Tryonia: Tryonia kosteri
- Kosztarab’s Common Stonefly: Acroneuria kosztarabi
- Kosztarab’s Gall-Like Coccoid: Allokermes kosztarabi
- Kotagama’s Dwarf Toad: Bufo kotagamai
- Koteja’s Mealybug: Longicoccus festucae
- Koteja’s Soft Scale: Luzulaspis nemorosa
- Kotnog: Zenarchopterus cotnog
- Kotso: Paretroplus petiti, Tachyusa orientis
- Kotsovato: Paretroplus kieneri
- Kottelat Rasbora: Rasbora hobelmani
- Koua River Prawn: Macrobrachium australe
- Kouman’s Prawn-Goby: Cryptocentrus koumansi
- Kouprey: Bos sauveli
- Kowari: Dasyuroides byrnei
- Kozlov’s Pika: Ochotona koslowi
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