Description: Both males and females have an "armored" body with a muscular, flat tail. The skin on their back is armored with embedded bony plates called osteoderms or scutes. They have four short legs; the front legs have five toes while the back legs have only four toes. Alligators have a long, rounded snout that has upward facing nostrils at the end; this allows breathing to occur while the rest of the body is underwater. The young have bright yellow stripes on the tail; adults have dark stripes on the tail.

It's easy to distinguish an alligator from a crocodile by the teeth. The large, fourth tooth in the lower jaw of an alligator fits into a socket in the upper jaw and is not visible when the mouth is closed. This does not happen in crocodiles. Alligators have between 74 and 80 teeth in their mouth at a time. As they wear down, they are replaced. An alligator can go through 3,000 teeth in a lifetime.

Male alligators are larger than female alligators. The average adult size for a female is 8.2 feet, and the average size for a male is 11.2 feet. Exceptionally large males can reach a weight of nearly half a ton or 1,000 pounds

Habitat: They inhabit swamps, streams, rivers, ponds, and lakes. A lone American alligator was spotted for over 10 years living in a river north of Atlanta, Georgia. Females and juveniles are also found in Carolina Bays and other seasonal wetlands. While they prefer fresh water, American alligators may sometimes wander into brackish water, but are less tolerant of salt water than American crocodiles, as the salt glands on their tongues do not function. One study of American alligators in north-central Florida found the males preferred open lake water during the spring, while females used both swampy and open-water areas. During summer, males still preferred open water, while females remained in the swamps to construct their nests and lay their eggs. Both sexes may den underneath banks or clumps of trees during the winter. In some areas of their range, American alligators are an unusual example of urban wildlife; golf courses are often favoured by the species due to an abundance of water and a frequent supply of prey animals such as fish and birds.

Range: American alligators, being native both to the Nearctic and Neotropical realms, are found in the wild in the Southeastern United States, from the Lowcountry in South Carolina, south to Everglades National Park in Florida, and west to the southeastern region of Texas. They are found in parts of North Carolina, South Carolina, Georgia, Florida, Louisiana, Alabama, Mississippi, Arkansas, Oklahoma and Texas. Some of these locations appear to be relatively recent introductions, with often small but reproductive populations. Louisiana has the largest American alligator population of any U.S. state. In the future, possible American alligator populations may be found in areas of Mexico adjacent to the Texas border. Alligators have been naturally expanding their range into Tennessee, and have established a small population in the southwestern part of that state via inland waterways, according to the state's wildlife agency.

Found in these States: AL | FL | GA | KS | LA | MS | NC | OK | SC | TN | TX

Diet: American alligators are considered an apex predator throughout their range. They are opportunists and their diet is determined largely by both their size and age and the size and availability of prey. Most American alligators eat a wide variety of animals, including invertebrates, fish, birds, turtles, snakes, amphibians, and mammals. Hatchlings mostly feed on invertebrates such as insects, insect larvae, snails, spiders, and worms, as well as small fish and frogs. As they grow, American alligators gradually expand to larger prey. Once an American alligator reaches full size and power in adulthood, any animal living in the water or coming to the water to drink is potential prey. Most animals captured by American alligators are considerably smaller than itself.

Reproduction: The breeding season begins in the spring. On spring nights, American alligators gather in large numbers for group courtship, in the aforementioned "water dances". The female builds a nest of vegetation, sticks, leaves, and mud in a sheltered spot in or near the water.

Eggs: After the female lays her 20 to 50 white eggs, about the size of a goose egg, she covers them with more vegetation, which heats as it decays, helping to keep the eggs warm. This differs from Nile crocodiles, which lay their eggs in pits. The temperature at which American alligator eggs develop determines their sex. Studies have found that eggs hatched at a temperature below 88.7 °F or a temperature above 94.1 °F will produce female offspring, while those at a temperature between 90.5 °F to 92.3 °F will produce male offspring. The nests built on levees are warmer, thus produce males, while the cooler nests of wet marsh produce females. The female remains near the nest throughout the 65-day incubation period, protecting it from intruders. When the young begin to hatch — their "yelping" calls can sometimes even be heard just before hatching commences — the mother quickly digs them out and carries them to the water in her mouth, as some other crocodilian species are known to do.

Young: The young are tiny replicas of adults, with a series of yellow bands around their bodies that serve as camouflage. Hatchlings gather into pods and are guarded by their mother and keep in contact with her through their "yelping" vocalizations. Young American alligators eat small fish, frogs, crayfish, and insects. They are preyed on by large fish, birds, raccoons, Florida panthers, and adult American alligators. Mother American alligators eventually become more aggressive towards their young, which encourages them to disperse. Young alligators grow 3–8 inches a year and reach adulthood at 6 feeet.

Status: The American alligator (Alligator mississippiensis) occupies all of its historical range at or close to carrying capacity. The population is abundant and is currently considered to be stable (or growing) at between 0.75 and 1.06 million adults that are well protected and managed. Sustainable use programmes for this species are in place with well implemented monitoring programmes. Therefore, it remains in the Least Concern category.

Taxonomy: