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Are black caimans larger than alligators?
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Closeup of a Black Caiman (Melanosuchus niger) facing the camera as it enters the water from a muddy riverbank in Pampas del Yacuma, Bolivia. An American alligator rests on a mound of vegetation at the edge of a swamp, surrounded by large green leaves, with its reflection visible in the water.
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Closeup of a Black Caiman (Melanosuchus niger) facing the camera as it enters the water from a muddy riverbank in Pampas del Yacuma, Bolivia.
Black caiman (Melanosuchus niger) A black caiman (Melanosuchus niger) entering the water. Although black caimans are able to hunt on land, they strike primarily from the water to surprise their prey.

Are black caimans larger than alligators?

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Black caimans (Melanosuchus niger) are the largest members of Alligatoridae, a family of reptiles made up of eight living species. Even though American alligators (Alligator mississippiensis) have a reputation for being large and menacing, black caimans—the dominant predators of the Amazon River basin—are larger. While some American alligators can grow up to 4.5 meters (15 feet) long and weigh as much as 363 kg (800 pounds), they still fall short of the maximum size of black caimans. Average-sized adult black caimans typically reach lengths of 4 to 5 meters (13 to 16 feet) and weigh approximately 350 kg (770 pounds), but the lengths of the largest black caimans approach 6 meters (20 feet) and weigh more than 400 kg (882 pounds).

An American alligator rests on a mound of vegetation at the edge of a swamp, surrounded by large green leaves, with its reflection visible in the water.
American alligator (Alligator mississippiensis)An American alligator (Alligator mississippiensis) in a Florida swamp.

American alligators—which are found in freshwater rivers, lakes, and swamps in the southeastern United States—are still formidable. They are also apex predators. Despite being slightly smaller than black caimans, American alligators are the larger of the two alligator species, and they typically reach lengths of about 3 to 3.4 meters (9.8 to 11.1 feet) and weigh about 150 kg (331 pounds). The other species in the Alligator genus, the Chinese alligator (A. sinensis), is smaller, having a maximum length of about 2.1 meters (7 feet).

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