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Taxonomy. The average size for an adult female American alligator is 8.2 feet (2.6 m), and the average size for a male is 11.2 feet (3.4 m). Exceptionally large males can reach a weight of nearly half a ton or 1,000 pounds.merican alligators may live to about 50 years in the wild. After it is four feet long, an alligator is safe from predators except humans and occasionally other alligators. All or part of this information was provided by the Animal Diversity Web and Museum of Zoology of the University of Michigan.
1 The average lifespan of American alligators is 35 to 50 years. 2  The group of alligators is called congregation. 3  The largest American alligator ever observed was measured at 19.8 feet (6 meters) but there is little evidence to support this argument.4  Alligators are generally solitary and territorial species.ere are some of the most informative American alligator facts such as American alligator diet, habitat, reproduction, and behavior. The American alligator (Alligator mississippiensis) , also known as common alligator, is a large crocodilian reptile that is native to the Southeastern United States.