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Piciformes

Nine families of largely arboreal birds make up the orderPiciformes, the best-known of them being the Picidae, which includes the woodpeckers and close relatives. The Piciformes contain about 67 living genera with a little over 400 species, of which the Picidae ( woodpeckers and relatives) make up about half.

In general, the Piciformes are insectivorous, although the barbets and toucans mostly eat fruit and the honeyguides are unique among birds in being able to digest beeswax (although insects make up the bulk of their diet). Nearly all Piciformes have parrot-like zygodactyl feet—two toes forward and two back, an arrangement that has obvious advantages for birds that spend much of their time on tree trunks. An exception are a few species of three-toed woodpeckers. The jacamars aside, Piciformes do not have down feathers at any age, only true feathers. They range in size from the rufous piculet at 8 centimetres in length, and weighing 7 grams, to the toco toucan, at 63 centimetres long, and weighing 680 grams. All nest in cavities and have altricial young.

The Collaborative International Dictionary

Piciformes

Piciformes \Pic`i*for"mes\ (p[i^]s`[i^]*f[^o]r"m[=e]z), prop. n. pl. [NL. See Picus, and -form.] (Zo["o]l.) A group of birds including the woodpeckers, toucans, barbets, colies, kingfishes, hornbills, and some other related groups.