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Rana catesbeiana

(North American bullfrog)

Overview

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Amphibian. The bullfrog has been widely distributed via aquaculture and the aquarium trade. It is one of the most frequently cultivated edible frogs , worldwide. Primary concerns are competition with and predation upon native herpetofauna.

Interesting Facts

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Common Names

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Click on the language to view common names.

Common Names in English:

American Bullfrog, bullfrog, bullfrogs, North American bullfrog

Common Names in French:

Grenouille taureau, ouaouaron

Common Names in German:

Ochsenfrosch

Common Names in Japanese:

ウシガエル

Common Names in Spanish:

Rana toro

Description

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Physical Description

Species Rana catesbeiana

Dorsal color is light green to olive to brownish-green, often with a mottled pattern of greens and browns. A fold of skin runs from the eye around conspicuous eardrums. The mostly white ventral surface may be mottled with gray.

Size/Age/Growth

Large size: adults 10-20 cm snout-to-vent length and 60-900 g.

Habitat

Prefers to live in larger bodies of water, and particularly in grasses along the banks of quiet waters.

Typically found at an altitude of 0 to 5,478 meters (0 to 17,972 feet).[1]

Ecology: This species inhabits ponds , swamps , lakes , reservoirs , marshes, brackish ponds (in Hawaii), stream margins and irrigation ditches. It is sometimes found in temporary waters hundreds of metres from permanent water. It winters at the bottom of pools . It may disperse from water in wet weather. Eggs and larvae develop in permanent slow or non-flowing bodies of water.

List of Habitats : 1.4 Forest - Temperate 3.4 Shrubland - Temperate 4.4 Grassland - Temperate 5.1 Wetlands (inland) - Permanent Rivers/Streams/Creeks (includes waterfalls ) 5.2 Wetlands (inland) - Seasonal/Intermittent/Irregular Rivers/Streams/Creeks 5.4 Wetlands (inland) - Bogs , Marshes, Swamps, Fens , Peatlands 5.5 Wetlands (inland) - Permanent Freshwater Lakes (over 8ha) 5.6 Wetlands (inland) - Seasonal/Intermittent Freshwater Lakes (over 8ha) 5.7 Wetlands (inland) - Permanent Freshwater Marshes/Pools (under 8ha) 5.8 Wetlands (inland) - Seasonal/Intermittent Freshwater Marshes/Pools (under 8ha) 5.9 Wetlands (inland) - Freshwater Springs and Oases 5.13 Wetlands (inland) - Permanent Inland Deltas 14.1 Artificial/Terrestrial - Arable Land 14.2 Artificial/Terrestrial - Pastureland 14.4 Artificial/Terrestrial - Rural Gardens 14.5 Artificial/Terrestrial - Urban Areas 15.1 Artificial/Aquatic - Water Storage Areas (over 8ha) 15.2 Artificial/Aquatic - Ponds (below 8ha) 15.3 Artificial/Aquatic - Aquaculture Ponds 15.5 Artificial/Aquatic - Excavations (open) 15.7 Artificial/Aquatic - Irrigated Land (includes irrigation channels) 15.8 Artificial/Aquatic - Seasonally Flooded Agricultural Land 15.9 Artificial/Aquatic - Canals and Drainage Channels , Ditches

Biology

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Diet

Larvae eat organic debris , algae, plant tissue , suspended matter and small aquatic invertebrates . Adults consume any animal that can be swallowed, even snakes , bids, fish, crawfish, and other frogs . It is a voracious feeder and eats almost anything that it can swallow, including insects, crayfish, earthworms, leeches, spiders, snails, salamanders, frogs, snakes, turtles, lizards, fishes , birds, shrews, moles , and bats.

Reproduction

Sexual. Breeds from February to October. Its call sounds like a jug o'rum. External fertilization of unshelled eggs takes place as the eggs are deposited in water. Egg masses are attached to vegetation which is in water. The jelly-coated eggs form a floating raft which may measure as much as a meter across. Eggs hatch in 3-5 days. Bullfrogs breed from early spring through late summer, depending upon local climate.Gravid females commonly contain from 1,000 to 20,000 eggs, with larger females producing larger clutches. Maximum clutch size is over 40,000 eggs. They will produce multiple clutches in a season under favorable conditions.

These amphibians undergo a completely aquatic life stage before metamorphosing into semi-aquatic adults . This larval stage is variable in length , from 4 months to over 2 years, taking longer in colder climates.

Behavior

This frog is highly aquatic , and never strays far from permanent water, whether it be marsh , pond , lake , or reservoir . It sometimes frequents temporary water bodies long distances from permanent water. It prefers water with thick aquatic vegetation such as cattails and can even tolerate brackish water. The Bull Frog is not dependent on rainfall for breeding. It is nocturnal but calling commonly occurs during the day as well. The Bull Frog winters at the bottom of water bodies.

The Bullfrog is eaten by water snakes , snapping turtles, large fish, herons, opossums, skunks, and raccoons. To escape cold winter temperatures , the Bullfrog burrows into the mud at the bottom of lakes, streams , or ponds.

Call is a deep pitched "jug-o-rum" or "Br-wum" bellow. Calls are made during the day and night. It can be heard up to 1/4 mile away.

Taxonomy

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Notes

Name Status: Accepted Name . Latest taxonomic scrutiny: 29-Aug-2005.

Similar Species

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The largest frog in North America, this frog ranges from yellowish green to brown. It can be distinguished from the Green Frog because it does not have dorsolateral ridges. The Pig Frog has webbing to the very tips of the toes. The River Frog has white spots on its lips.

Members of the genus Rana

ZipcodeZoo has pages for 132 species and subspecies in this genus. Here are just 100 of them:

R. adenopleura (Olive Frog) · R. amurensis (Siberian Wood Frog) · R. andersonii (Yunnan Odorous Frog) · R. areolata (Northern Crawfish Frog) · R. areolata aesopus (Crawfish Frog) · R. areolata areolata (Southern Crawfish Frog) · R. areolata circulosa (Northern Crawfish Frog) · R. arfaki (Arfak Mountains Frog) · R. arvalis (Altai Brown Frog (Altai Mountains Populations)) · R. asiatica (Central Asiatic Frog) · R. asperata (Yangambi Butterbarbel) · R. aurantiaca (Golden Frog) · R. aurora (California Red-Legged Frog) · R. aurora aurora (Northern Red-Legged Frog) · R. aurora draytonii (California Red-Legged Frog) · R. baramica (Baram River Frog) · R. bergeri (Italian Poolfrog) · R. berlandieri (Rio Grande Leopard Frog) · R. blairi (Plains Leopard Frog) · R. boylii (Foothill Yellow-Legged Frog) · R. boylii boylii (Foothill Yellow Legged Frog) · R. brownorum (Brown's Leopard Frog) · R. bwana (Rio Chipillico Frog) · R. camerani (Iranian Long-Legged Frog) · R. capito (Carolina Gopher Frog) · R. capito aesopus (Florida Gopher Frog) · R. capito capito (Carolina Gopher Frog) · R. capito sevosa (Dusky Gopher Frog) · R. cascadae (Cascades Frog) · R. catesbeiana (North American Bullfrog) · R. chalconota (Schlegel's Java Frog) · R. chapaensis (Chapa Frog) · R. chensinensis (Asiatic Grass Frog) · R. chiricahuensis (Chiricahua Leopard Frog) · R. clamitans (Bronze Frog) · R. clamitans clamitans (Bronze Frog) · R. clamitans melanota (Northern Green Frog) · R. cubitalis (Siam Frog) · R. daemeli (Australian Wood Frog) · R. dalmatina (Agile Frog) · R. draytonii (California Red-Legged Frog) · R. dunni (Patzcuaro Frog) · R. dybowskii (Dybowski's Frog) · R. emelijanovi (Imeinpo Station Frog) · R. esculenta (Edible Frog) · R. fasciata (Tanganyika Striped Grass Frog) · R. fisheri (Las Vegas Leopard Frog) · R. forreri (Forrer's Grass Frog) · R. galamensis (Galam White-Lipped Frog) · R. glandulosa (Sarawak Frog) · R. graeca (Greek Stream Frog) · R. grylio (Pig Frog) · R. heckscheri (River Frog) · R. hecksheri (River Frog) · R. hejiangensis (Hejiang Frog) · R. holsti (Holst's Frog) · R. holtzi (Taurus Frog) · R. hosii (Mount Dulit Frog) · R. iberica (Iberian Frog) · R. ishikawae (Ishikawa's Frog) · R. italica (Italian Stream Frog) · R. japonica (Japanese Brown Frog) · R. johnsi (John's Groove-Toed Frog) · R. juliani (Maya Mountains Frog) · R. latastei (Italian Agile Frog) · R. lessonae (Pool Frog) · R. livida (Green Cascade Frog) · R. luteiventris (Great Basin Spotted Frog) · R. macrocnemis (Iranian Long-Legged Frog) · R. macroglossa (Guatemala Plateau Frog) · R. maculata (Highland Frog) · R. magnaocularis (Northwest Mexico Leopard Frog) · R. malabarica (Fungoid Frog) · R. maosonensis (Mo-Son Frog) · R. melanomenta (Sulu Frog) · R. montezumae (Montezuma Leopard Frog) · R. muscosa (Southern Mountain Yellow-Legged Frog) · R. narina (Ryukyu Island Frog) · R. neovolcanica (Transverse Volcanic Leopard Frog) · R. nicobariensis (Nicobar Island Frog) · R. nigromaculata (Black-Spotted Pond Frog) · R. nigromaculata nigromaculata (Black-Spotted Pond Frog) · R. nigrovittata (Black-Striped Frog) · R. okaloosae (Florida Bog Frog) · R. okaloossae (Florida Bog Frog) · R. omiltemana (Guerreran Leopard Frog) · R. onca (Relict Leopard Frog) · R. ornativentris (Montane Brown Frog) · R. palmipes (Amazon River Frog) · R. palustris (Pickerel Frog) · R. perezi (Perez's Frog) · R. pipiens (Northern Leopard Frog) · R. pipiens pipiens (Northern Leopard Frog) · R. pleuraden (Yunkwei Plateau Frog) · R. pretiosa (Oregon Spotted Frog) · R. pustulosa (Cascade Frog) · R. pyrenaica (Pyrenean Frog) · R. raniceps (Peters' Malaysian Frog) · R. ridibunda (European Green Frog) · R. rugosa (Wrinkled Frog)

More Info

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Further Reading

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Notes

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Contributors

Data Sources

Accessed through GBIF Data Portal February 29, 2008:

Identifiers

Footnotes

  1. Mean = 402.840 meters (1,321.654 feet), Standard Deviation = 563.910 based on 547 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
Last Revised: July 13, 2012