The giant kangaroo rat is the largest of more than 20 species of kangaroo rats, which are small rodents that (as their name would suggest) move by hopping on their back legs. The front limbs are reduced and used only for digging, whist the hind limbs are long and powerful and the exceptionally long tail is used for balance (4). The hind legs can propel an individual in leaps of over 2 metres when escaping from predators (2). As with other kangaroo rats, this species has large eyes, small rounded ears and a somewhat rounded body (5). The fur is buff-coloured, and it has a white belly and a white stripe across the hindquarters. The tufted tail is dark but has white lines along either side (5).