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Columbidae is a bird family consisting of doves and pigeons. In English, the smaller species tend to be called doves and the larger ones pigeons, but this distinction is not always consistent and scientifically there is no separation between them. Pigeons and doves are distributed everywhere on Earth, except for the driest areas of the Sahara, Antarctica and its surrounding islands, and the high Arctic. The family has adapted to most of the habitats available on the planet. There is a considerable variation in size between species, ranging in length from 15 to 75 cm (6 to 30 in), and in weight from 30 g (1 oz) to above 2 kg (4 lb). Overall, the anatomy of Columbidae is characterized by short legs, short bills with a fleshy beak, and small heads on large, compact bodies. The wings are large, and have eleven primary feathers; they have strong wing muscles and are among the strongest fliers of all birds. They primarily feed on seeds, fruits, and plants. This red-eyed dove (Streptopelia semitorquata) was photographed on the Zambezi in Zimbabwe, near Kazungula Bridge.Photograph credit: Charles J. Sharp