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Alligators and crocodiles belong to the order Crocodilia, sharing traits such as ectothermy and a robust, predator‑resistant build. Their last common ancestor split about 90 million years ago, placing them in distinct families—Alligatoridae (alligators) and Crocodylidae (crocodiles). While they look remarkably similar, their evolutionary paths diverged long before modern habitats formed.

Where to Find These Reptiles in the Wild

Only two alligator species exist: the critically endangered Alligator sinensis (Chinese alligator) and the widespread Alligator mississippiensis (American alligator). The American species ranges from Texas to Florida, extending north to Arkansas and the Carolinas, and its population now exceeds 5 million.

In Florida, alligators dominate—about 1.25 million individuals—while the state hosts roughly 1,000 adult American crocodiles, excluding hatchlings. Across the Americas, the American crocodile is found in the Caribbean, Mexico, Central and South America, and southern Florida. Globally, crocodiles comprise 16 species, including the ferocious saltwater and Nile crocodiles.

Everglades National Park, the largest subtropical wilderness in the United States, provides the unique conditions that allow both reptiles to thrive together. Alligators require fresh water, whereas crocodiles are adapted to brackish environments where fresh and salt water mix. Many crocodile species possess salt‑excretion glands on their tongues, enabling them to inhabit saline habitats—a key factor in their broader global distribution.

The Everglades’ ecosystem—where Lake Okeechobee’s freshwater meets the Atlantic’s brackish waters—creates a natural overlap that brings alligators and crocodiles into the same landscape, a phenomenon unseen elsewhere in the country.

Do They Co‑Exist Peacefully?

Despite competing for similar prey—fish, turtles, birds, reptiles, and mammals—alligators and crocodiles in the Everglades exhibit minimal aggression toward one another. Large male alligators tend to be solitary and territorial, but they rarely encroach on crocodile territories. Crocodiles, while generally more aggressive, are fewer in number and are often found near Flamingo Marina or in mangrove habitats.

Observations suggest that both species coexist without significant conflict, indicating a natural balance in this unique environment.