Caiman Lizard

About the caiman lizard

The northern caiman lizard, commonly known simply as the caiman lizard, is a large, heavy-bodied lizard native to northern South America. It is built along similar lines to its relative the tegu, with short but powerful limbs and a bulky head that is often red or orange in color. Its jaws are unusually muscular, an adaptation suited to its favorite prey: snails, crawfish, and freshwater clams.

The lizard's body is typically bright green with faint dark green banding, and rows of raised, horn-like scales run along its back, offering some defense against predators. Its most distinctive feature is a long, flattened tail resembling that of a caiman, which it uses to swim and dive. It also has a clear third eyelid thought to work like a pair of underwater goggles. Adults can reach up to 4 feet (1.2 m) in length and weigh as much as 10 pounds (4.5 kg).

Caiman lizards live in the swampy, flooded, wooded habitats of Brazil, Colombia, Ecuador, Peru, and the Guianas. They are mostly aquatic and are excellent climbers, spending much of the day basking on branches that overhang waterways, ready to drop underwater and escape if threatened.

Behavior and diet

The caiman lizard spends most of its time in or near water, retreating to trees and bushes at night. Its diet consists of a wide range of prey found in and around its wetland habitat, including snails, fish, amphibians, crabs, crawfish, clams, other invertebrates, and eggs, but it specializes in snails above all else. When eating a snail, it grips the shell in its jaws, tilts its head back so the prey slides toward the rear of its mouth, and crushes it with its powerful back teeth before spitting out the shell fragments. It has also been documented killing and eating Amazon river turtles by crushing the edges of the shell to reach the softer parts inside, and it will occasionally hunt rodents. Like its tegu relatives, it is also known to burrow.

Little is known about the caiman lizard's habits from direct study of wild populations; much of what is documented comes from animals kept in zoos, aquariums, and private collections rather than field research, and no population study of the wild population has been completed.

Range and habitat

The caiman lizard is found in Brazil, Colombia, Ecuador, Peru, and the Guianas in northern South America, where it inhabits swampy areas and other wooded habitats that flood seasonally. It is mostly aquatic, spending much of its time in or around waterways and using overhanging branches as basking spots from which it can quickly retreat underwater.

The species was heavily hunted historically for its hide, but that pressure eased after it was granted legal protection in 1970, which caused hide exports to drop sharply. Today, populations in areas where their habitat is protected are considered safe, and captive breeding farms now supply the leather trade, reducing pressure on wild animals. In more recent years, some farmed hatchlings have entered the pet trade as well.

Conservation status

The caiman lizard is listed as Least Concern by the IUCN. Its wild population size is unknown, since no dedicated field study of the species has been carried out. Historical hunting for hides was a significant pressure before 1970 protections were put in place; captive breeding farms have since reduced reliance on wild-caught animals for the leather trade.