CAIMAN- Caiman is a reptile that is closely related to alligators and crocodiles. Caimans live in swamps, flooded savannas, mangroves, slowly moving rivers and lakes. Caimans have few natural predators because of their size and aggressive temper. Jaguars are the greatest enemies of caimans. Caimans can reach 5 to 20 feet in length and weigh from 220 to 1100 pounds, depending on the species.