American Alligator Facts

Adults usually run 8 to 13 feet, with big males approaching or topping 14 feet and several hundred pounds; females stay smaller. The broad, U-shaped snout sets alligators apart from most crocodiles, and when the mouth shuts, the lower teeth tuck out of sight — a quick field clue. Bony plates called osteoderms armor the thick skin. Eyes, ears, and nostrils sit high on the head so the animal can watch and breathe while submerged; a clear third eyelid protects the eyes underwater, and a throat flap seals the airway so it can open its jaws below the surface without drowning. The muscular tail drives sudden surges and the thrashing "death roll." Alligators are close kin to the smaller Chinese alligator and, more distantly, to crocodiles and caimans — a lineage that has held warm American wetlands for millions of years.

Alligators occupy marshes, cypress swamps, river floodplains, lakes, canals, and some brackish coastal water across the U.S. Southeast. The strongholds are Florida's Everglades and Big Cypress, Georgia's Okefenokee Swamp, Louisiana's coastal marshes, and refuge wetlands from the Carolinas to eastern Texas. They are ecosystem engineers: adults dig "gator holes" that hold water through drought, creating refuges that fish, turtles, and wading birds depend on. Because they are cold-sensitive, they go inactive in cold snaps and shelter in dens or deep water until it warms.

Alligators are opportunistic carnivores whose menu grows with them. Hatchlings take insects, small fish, and amphibians; adults move on to fish, turtles, waterbirds, snakes, and mammals that come to drink. Big prey may be seized, dragged under, and torn apart with a spinning death roll. Hunting is almost always ambush — the animal floats motionless, then explodes forward in a snap of jaws. Digestion slows in cool weather, so a single large meal can sustain an adult for weeks, an efficiency that lets alligators thrive where prey shifts with the seasons.

Outside nesting season alligators are largely solitary, though many will share a productive lake or swamp. In spring, males bellow to claim territory and draw females — deep calls that carry across the marsh and make the water dance above their backs. Disputes are settled with size displays, hissing, and sometimes serious bites. They bask to warm up after cool nights and hunt most actively in darkness. On land they can sprint in short bursts, but water is where they win. People should keep their distance: feeding wild alligators is illegal in many states precisely because it teaches them to approach humans.

Breeding peaks in spring. The female builds a mound of vegetation and mud near the water and lays roughly 20 to 50 eggs; as the plant matter composts it warms the clutch for about 65 days. Nest temperature sets the sex of the young — warmer nests skew male, cooler nests female. When the hatchlings chirp, the mother opens the nest and may carry her babies gently to the water in her jaws. Young keep bright yellow banding for camouflage, and many are still lost to raccoons, birds, snakes, and large fish, but a guarding mother improves the odds through the first months. Survivors grow slowly into apex predators; wild alligators often live several decades, and some in captivity pass 70 years.

The American alligator is listed as Least Concern, with stable or recovering numbers after hunting drove it near commercial extinction in the early 1900s. Legal protection and managed harvest programs brought it back across much of its range — a genuine conservation success. Threats persist, though: wetland drainage, coastal development, and water pollution shrink or degrade habitat, roads kill wanderers, and illegal feeding breeds dangerous conflict. Protecting freshwater wetlands, and respecting wildlife-viewing rules, keeps alligators and the many species that rely on their gator holes secure.

• IUCN Red List of Threatened Species: Alligator mississippiensis
• Animal Diversity Web: Alligator mississippiensis
• Smithsonian's National Zoo: American Alligator
• National Geographic: American Alligator
• U.S. Fish & Wildlife Service: American Alligator