Head and body length, 16.8 - 24.7 cm
180 - 234 g
Prefers relatively arid steppe grasslands; also found in areas dominated by woody shrubs
The more the merrier. The colonial tuco-tuco is extremely socal, living in burrows with as many as six individuals sharing a single nesting site. There is always just one male in each group, and males disperse every year to avoid mating with their own offspring. Nesting communally helps increase the survivability of their young, as multiple adults pitch in to take care of the next generation together. But populations are still falling due to loss and degradation of thier very limited habitat.