They have wide, gaping mouths with hooked beaks, large eyes and short legs with weak feet. Many species are two-colored, featuring grey and red phases. Nyctibiidae Potoos 5 Steatornithidae Oilbird 1 Apodiformes Apodidae Swifts 80 Worldwide aerial birds that depend on their flying skills for food. Swifts are insectivorous and migratory. While on the wing they feed, mate, collect nest materials, drink and even, in some species, pass the night at high altitudes.
Hummingbirds feed on nectar, suplemented with insects.
35 Americas, Asia, Sub-Saharan Africa colourful, sedentary, arboreal birds that feed on fruit and insects. They nest in tree cavities and termite mounds. Coraciiformes Alcedinidae Kingfishers 87 Worldwide the three anterior toes on these birds are united, an adaptation for perching and tree-climbing. Many are brightly coloured, some are social. All nest in cavities, digging holes in, for example, earth banks or rotten trees.