The ostrich is the largest living bird, attaining a height of 2.5 metres and a weight of 135 kilograms. It is a flightless bird with a long neck, a small head with large eyes and a short, broad beak. When it runs on its long, powerful legs, its small wings spread out. Ostriches make loud, hissing sounds.
Male ostriches are black with white tips on the wings and tail.
The females are a dull grayish-brown. Ostriches have been known to live to 70 years old. Emus Emus are the second largest living bird, attaining a height of 1.8 metres and a weight of 55 kilograms. Originating from Australia, the emu's feathers are grayish-brown with black stripes running from the head down the back. The eggs are dark green, and are about 10 cm long.