black caiman, (Melanosuchus niger), large caiman species best known as being the largest predator in the Amazon River basin and the largest member of the alligator family (Alligatoridae). The species is found in wetlands, flooded savannas, rivers, and other freshwater environments in northern South America, from eastern Ecuador eastward to southeastern Colombia, Guyana, French Guiana, and northern Brazil and southward through eastern Peru, northern Bolivia, and central Brazil. Most adults are massive individuals, measuring between 4 and 5 meters (13 and 16 feet) in length and roughly 350 kg (770 pounds) in weight; indeed, some exceptionally large black caimans have ...(100 of 779 words) Access the full article Help support true facts by becoming a member. Subscribe today!