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The sunbirds and spiderhunters are very small passerine birds which feed largely on nectar, although they will also take insects, especially when feeding young. Flight is fast and direct on their short wings. Most species can take nectar by hovering like a hummingbird, but usually perch to feed. Although they are completely unrelated, the sunbirds find counterparts in the hummingbirds of the Americas and the honeyeaters of Australia. The resemblances are due to convergent evolution due to the similar nectar-feeding lifestyle. The sunbirds are tropical species, with representatives from Africa to Australasia; however, the greatest variety of species is in Africa where the group probably arose. Most species are sedentary or short-distance seasonal migrants. Like the hummingbirds, they are strongly sexually dimorphic, with the males usually brilliantly plumaged in metallic colours. Sunbirds have long thin down-curved bills and brush tipped tubular tongues, both adaptations to their nectar feeding. Up to three eggs are laid in a purse-shaped suspended nest.
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