Rodents
Mammals with front teeth that never stop growing, such as mice, squirrels, beavers and capybaras.
3 entries
CapybaraHydrochoerus hydrochaerisThe world's largest rodent, a grass-eating swimmer of South American riverbanks that lives in groups.
Naked Mole RatHeterocephalus glaberA nearly hairless underground rodent of East Africa that lives in colonies run by a single queen, like bees.
Patagonian MaraDolichotis patagonumA long-legged Argentine rodent that looks like a cross between a hare and a small deer and can run 35 miles per hour.