Flightless bird also included here. Flightless bird Flightless birds are birds that through evolution lost the ability to fly. There are over 60 extant species including the well known ratites (ostrich, emu, cassowary, rhea and kiwi) and penguins. The smallest flightless bird is the Inaccessible Island rail (length 12.5 cm, weight 34.7 g). The largest (both heaviest and tallest) flightless bird, which is also the largest living bird, is the ostrich (2.7 m, 156 kg). Ostriches are farmed for their decorative feathers, meat and their skins, which are used to make leather. Many domesticated birds, such as the domestic chicken and domestic
Long-crested eagle another bird, for example the black sparrowhawk or lizard buzzard. It breeds all year but most eggs are laid in July–November. The female lays 1-2 eggs, and she take most of the burden of incubating them, incubation lasting 42 days, as she incubates the male provides her with food. As is normal in birds of prey the eggs are laid asynchronously, as much as two weeks apart, and the female begins incubation as soon as the first egg is laid which mans that hatching is also asynchronous. When the young hatch they are initially mainly fed by the male. The