All have 2nd and 3rd or 3rd and 4th toes joined at base. Food largely animal, except hornbills, which eat much fruit. Length 9 to 160 cm. Food insects and fruit. Woodpeckers are modified for climbing.
Honey guides are brood parasites.
Length 9 to 61 cm. The large complex assemblage of perching birds, containing more than half of the known species of birds. Bill, plumage, and habits highly varied. Length 7.5 to 102 cm. It has frequently been stated that birds are one of the best known of animal groups.