The Emu is the second-largest living bird by height, after its relative, the ostrich. Emus are soft-feathered, brown, flightless birds with long necks and legs, and can reach up to 1.9 metres in height. Also, they can travel great distances, and when necessary can sprint at 50 km/h. Because they forage for a variety of plants and insects, they have been known to go for weeks without eating. Emus drink infrequently, but take in copious amounts of water when the opportunity arises.