A tegu is a common name for several species of large lizards belonging to the families Teiidae and Gymnophthalmidae. They are native to Central and South America and are known for their large size, predatory habits, and adaptability to various habitats including rainforests, savannas, and grasslands. Tegus typically have black mixed with other colors and patterns, such as yellow, reddish, or white bands along their backs. They have a streamlined body with long tails and strong legs. Most tegus grow to about 1 meter long, with some species like the black and white tegu reaching up to about 1.3 meters (4 feet 3 inches). Tegus use their tongues and a chemoreceptor organ called the vomeronasal organ to detect chemical cues related to prey. They resemble monitor lizards in appearance but are only distantly related, with their similarities being a result of convergent evolution. Some species of tegus, like the Argentine black and white tegu, are also kept as exotic pets due to their intelligence and docile nature. They are omnivorous and have a varied diet including fruits, vegetables, insects, small animals, and eggs. Tegus can be invasive outside their native range, for example in Florida, where released pets have established wild populations. They are active during the day, capable swimmers, and spend colder months in a hibernation-like state called brumation. Adult tegus can reach significant size and can defend themselves with sharp teeth, claws, and strong jaws. In summary, tegus are large, adaptable, and intelligent lizards native to South America, popular in the pet trade but potentially invasive in non-native environments. They have a distinctive appearance with patterned scales and are important both ecologically and commercially in their native regions.