Ostrich

Ostriches usually weigh from 90 to 130 kg (198 to 286 pounds), although some male ostriches have been recorded with weights of up to 155 kg (342 pounds). The feathers of adult males are mostly black, with some white on the wings and tail. Females and young males are grayish-brown, with a bit of white. The small vestigial wings are used by males in mating displays. They can also provide shadow to chicks. The feathers are soft and serve as insulation, and are quite different from the stiff airfoil feathers of flying birds. There are claws on two of the wings' fingers.