The malachite kingfisher ('Corythornis cristatus') is a river kingfisher which is widely distributed in Africa. The specific epithet cristata is from the Latin cristatus meaning "crested" or "plumed". The adjective "malachite" in the vernacular name normally refers to the dark green colour of the copper containing mineral.

It is a small kingfisher, around 13 cm (5.1 in) in length. In Southern Africa, the reference size is 14cm (5.5 in) and in East Africa and Ethiopia, 12cm (4.7 in). The general color of the upper parts of the adult bird is bright metallic blue. The head has a short crest of black and blue feathers, which gives rise to the scientific name. The face, cheeks, and underparts are rufous and there are white patches on the throat and rear neck sides. The bill is black in young birds and reddish-orange in adults; the legs are bright red.

The nest is a tunnel in a sandy bank, usually over water. Most burrows incline upward before the nesting chamber is reached. Three or four clutches of three to six round, white eggs are placed on a litter of fish bones and disgorged pellets. The bird has regular perches or stands from which it fishes. These are usually low over the water. It sits upright, its tail pointed downwards. It drops suddenly with a splash and usually returns at once with a struggling captive. Large food items are beaten on a bough or rail; small fish and insects are promptly swallowed. Fish, aquatic insects, and crustaceans are eaten.

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