Tuco-tuco, << TOO koh TOO koh, >> is a group of South American burrowing rodents that resemble gophers. There are dozens of species (kinds). Tuco-tucos grow about 8 to 14 inches (20 to 36 centimeters) in length, including a long tail. They have large heads, long front teeth, and powerful digging claws. The claws enable them to dig easily in the soil, while the teeth are used to gnaw through such objects as roots. Their hind feet possess stiff fringes of bristlelike hair, which the animals use as combs to groom their brownish or grayish fur. People often call tuco-tucos comb rats because of these foot combs. 
Tuco-tucos inhabit much of southern South America, especially the great plains region called the Pampas. The rodents live in large colonies that extend across as many as 17 acres (7 hectares). Each rodent usually inhabits its own burrow. The animals spend most of their lives below ground, feeding on roots and other underground plant parts. Occasionally, they venture above ground to find food.
The name tuco-tuco comes from a long, loud clicking call made mostly by the males. Scientists believe this call might serve to claim territory or to warn the colony against predators (hunting animals). Such predators include falcons, owls, and other birds of prey. Tuco-tucos can live up to three years in the wild.
