Overview
Federally protected. American alligator populations were in decline until the 1980 because of poaching for their hides and habitat
destruction. Populations have now recovered.
Alligator spotting techniques: Watch for eyes, head
or snout protruding from water surface. Also, use a flashlight at night to shine
on the water in order
to locate an alligator by its glowing red-orange eyes.
|
Threatened |
|
Common Names
Click on the language to view common names.
Common Names in English:
Alligator, Alligator, Gator, American Alligator, Florida Alligator, Mississippi Alligator, Louisiana Alligator., American Alligator, Florida Alligator, Gator, Louisiana Alligator, Mississippi Alligator
Common Names in German:
Mississippi-Alligator
Common Names in Russian:
Аллигатор щучий
Description
Physical Description
Species Alligator mississippiensis
The coloration
of adults
is blackish brown. Juveniles
have yellow crossbars
on the back and some tail markings.
Alligators have valves
in their ears and nostrils to keep water out. Because their mouths
lack lips
and thus do not shut completely, two flaps cover
the gullet and windpipe during dives. Its rear
legs
are longer
than its front legs and each foot
has four toes ending in claws
.
In the United
States, alligators grow larger than crocodiles.
Size/Age/Growth
6-19 feet long, nose to tail. Adults
usually range
from 6-12 feet in length
, but the maximum is more than 19 feet.
Weight
normally to 500 pounds
. A full grown
male may weigh up to 1200 pounds, while the female is slightly smaller.
Habitat
Usually seen in large streams , canals, ponds , lakes , marshes, swamps , and tidal estuaries.
Typically found at an altitude of 0 to 5,478 meters (0 to 17,972 feet).[1]
Biology
Diet
Alligators have a wide, varied diet
but tend to mainly feed
on turtles, snakes
, small mammals, crayfish, birds, mammals, and frogs
.
The alligators' food changes with age. The young feed on insects and on freshwater
shrimp. As they grow older they eat frogs, snakes and fish. Mature
adults
live mainly on fish but will catch
muskrats and small mammals that go down
to the water's edge
to drink. They also take a certain amount of waterfowl. Very large alligators may occasionally pull large mammals such as deer or cows
down into the water and drown them.
Reproduction
Alligators breed
from mid-May to late September. Later in the summer females lay
around 30 eggs
in a large mound of vegetation usually near the water around trees
. Decay of organic
material
in this "nest" helps warm the eggs and protects them from predators
. Females guard the nest
and care for the young up to three years after hatching
and sometimes even longer
.
In preparation for egg laying, the female searches for a place at the edge
of a pond
or marsh
where there is moist debris--leaf mold, twigs
and branches and even growing shrubbery. This she scrapes into a high mound and then digs a cavity
in the top of the heap in which she deposits about 29-68 eggs. Unlike most other reptiles
, she guards them until they hatch
about nine weeks later. Incubation
is 2-3 months.
When ready to hatch, baby
alligators make faint squeaking sounds
signaling their mother to help them tear open the mound. Baby alligators are 8 inches long when first hatched and grow 1 foot
a year, reaching maturity at 6-7 years of age. It is uncertain how long alligators live; in isolated protected habitats
they may live 50 years or more.
Young alligators are an easy prey
to carnivorous
fish, birds and mammals. At all stages of growth they are attached and eaten by large alligators.
Behavior
Alligators are diurnal
and nocturnal
. They live in large holes
called dens
, which provide protection from harsh
conditions. Alligators usually bask
in the spring
and summer outside of their dens.
Somewhat clumsy out of water, the alligator is superbly equipped to live in it. They are strong
swimmers and experts at drifting along on the surface, submerged except for their bulging eyes and nostrils. Their long flat jaws
not even making a ripple in the water as they stalk
turtles, swimming birds and fishes
.Adult alligators have dens to which they regularly retire. These dens are holes in riverbanks, and it is in them that the cooler months are weathered. Except at breeding time, they are likely to lead
a solitary existence.
Taxonomy
- Kingdom:
Animalia
(
)
- animals
- Phylum:
Chordata
(
)
- Chordates
- Class:
Reptilia
(
)
- Reptiles
- Order:
Crocodylia
(
)
- Family:
Crocodylidae (Alligatoridae) Crocodylia
(
)
- Family:
Crocodylidae (Alligatoridae) Crocodylia
(
- Order:
Crocodylia
(
- Class:
Reptilia
(
- Phylum:
Chordata
(
Unambiguous Synonyms
- Alligator lucius Clarke 1888
- Alligator lucius Duméril and Bibron 1836: 75
- Alligator lucius Dumril & Bibron 1836: 75
- Alligator mississippiensis Conant & Collins 1991: 39
- Alligator mississippiensis Holbrook 1842: 53
- Crocodilus cuvieri Leach 1815: 117
- Crocodilus lucius Cuvier 1807: 28
- Crocodilus mississipiensis Daudin 1802
Notes
Name Status: Accepted Name .
Similar Species
An alligator is much like a crocodile in appearance, but has a broader, more rounded snout. Also the fourth tooth from the front of the lower jaw lies inside the closed mouth rather than outside as it does in the crocodile.
Members of the genus Alligator
ZipcodeZoo has pages for 19 species and subspecies in this genus:
A. (Jacare) · A. chiapasius · A. cynocephalus · A. darwini · A. hantoniensis · A. latirostris · A. lucius · A. mcgrewi · A. mefferdi · A. missisippiensis · A. mississipiensis (Mississippi Alligator) · A. mississipp · A. mississippiensis (Mississippi Alligator) · A. olseni · A. prenasalis · A. punctulatus · A. sclerops · A. sinensis (Chinese Alligator) · A. thomsoni
More Info
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Further Reading
- A check list of North American amphibians and reptiles / by Leonhard Stejneger and Thomas Barbour. Cambridge: Harvard University Press; [etc., etc.]1923. ENG url p. 40, p. 45.
- A monographic study of the American marsupial, Caenolestes, by Wilfred H. Osgood, with a description of the brain of Caenolestes, by C. Judson Herrick. Chicago: Field Museum of Natural History, 1921. ENG url p. 161.
- Abhandlungen. Berlin, W. de Gruyter [etc.] GER url p. 65.
- Abhandlungen der Naturhistorischen Gesellschaft zu Nrnberg. Nrnberg: Conrad Geiger, 1852- GER url p. 11.
- Allen (1932) American Museum Novitates (542): 1-20
- Allsteadt et al. (1995) Herpetologica 51 (3): 314-325
- Amphibia and reptiles, by Hans Gadow. London, Macmillan and co., limited, 1901. ENG url p. 468.
- Anatomische Hefte, München [etc.]J.F. Bergmann. GER url p. 104, p. 108.
- Animal biology / by Robert H. Wolcott New York; McGraw-Hill Book Company, Inc., 1933. ENG url p. 381, p. 387, p. 587.
- Annalen des K.K. Naturhistorischen Hofmuseums. Wien: Alfred Hlder, 1886-1917. GER url p. 43, p. 43.
- Annals of the Carnegie Museum. [Pittsburgh]: Published by authority of the Board of Trustees of the Carnegie Institute, 1901- ENG url p. 569.
- Annual report of the Board of Regents of the Smithsonian Institution. Washington: Smithsonian Institution, -1965. ENG url p. 113, p. 113, p. 1219, p. 153, p. 162, p. 164, p. 168, p. 338, p. 560, p. 621, p. 621, p. 64, p. 75, p. 76, p. 76, p. 79, p. 91.
- Arbour et al. (2006) Proc. Okla. Acad. Sci. 86: 89-90
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- David Nicolson - ITIS Data Development Coordinator: According to the US Fish and Wildlife Service's Endangered Species site (2001), and quot;in 1987, the Fish and Wildlife Service pronounced the American alligator fully recovered and consequently removed the animal from the list of endangered species. Although the American alligator is secure, some related animals -- such as several species of crocodiles and caimans -- are still in trouble. For this reason, the Fish and Wildlife Service still regulates the legal trade in alligator skins, or products made from them, in order to protect these endangered animals with skin that is similar in appearance, but illegal in the commercial market and quot;
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Notes
Contributors
- Brands, S.J. (comp.) 1989-2006. Systema Naturae 2000. The Taxonomicon. Universal Taxonomic Services, Amsterdam, The Netherlands. Accessed October 3, 2006.
- Crocodile Specialist Group 1996. Alligator mississipiensis. In: IUCN 2006. 2006 IUCN Red List of Threatened Species. www.iucnredlist.org . Downloaded on 21 October 2006.
- Global Biodiversity Information Facility. Accessed February 27, 2008. http://www.gbif.org Mediated distribution data from 6 providers.
- Honolulu Zoo
- North Carolina Zoo, Asheboro, NC.
- Uetz, Peter. The Reptile Database
Data Sources
Accessed through GBIF Data Portal February 27, 2008:
- Borror Laboratory of Bioacoustics
- Marine Science Institute, UCSB: Paleobiology Database
- Museum of Comparative Zoology, Harvard University: MCZ Herpetology Collection - Reptile Database
- Museum of Vertebrate Zoology: Terrestrial vertebrate specimens
- Sternberg Museum of Natural History: Herp Collection
- University of Alberta: University of Alberta Herpetology Collection
- Yale University Peabody Museum: Peabody Herp Collection DiGIR provider Service
Identifiers
- Biodiversity Heritage Library NamebankID: 2535958
- Catalogue of Life Accepted Name Code: Rep-1177
- Integrated Taxonomic Information System (ITIS) Taxonomic Serial Number (TSN): 551771
- Natural Heritage Network Species Identifier: ARABA01010
- U.S. Fish and Wildlife Service Species Identifier: C000
- Zipcode Zoo Species Identifier: 13149
Footnotes
- Mean = 541.400 meters (1,776.247 feet), Standard Deviation = 1,737.390 based on 10 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
Curator for this page: Marco de Andrade. Date last reviewed: 12/30/1899
