6: Naked Mole Rat
Naked mole rats are a common sight in East Africa, where they burrow into the dry grasslands of Ethiopia, Somalia and Kenya. The naked mole rat has baffled scientists for decades thanks to a series of unusual biological traits. Naked mole rats are unusually long-lived for rodents; some have been documented at 32 years of age. They are also resistant to cancer and are capable of living in an environment with just a tiny amount of oxygen for hours on end. They are a common sight in zoos across America.