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. The Galbulidae and Bucconidae are often separated into a distinct Galbuliformes order. Analysis of nuclear genes confirms that they form a lineage of their own, but suggests that they are better treated as a suborder.
Jacamars and puffbirds (Galbulae)
Family Galbulidae - jacamars (18 species)
Family Bucconidae - puffbirds, nunbirds and nunlets (some 30 species)
Barbets, toucans, woodpeckers and relatives (Pici)
Family Lybiidae - African barbets (about 40 species, recently split from Capitonidae)
Family Megalaimidae - Asian barbets (about 25 species, recently split from Capitonidae)
Family Ramphastidae - toucans (about 40 species)
Family Semnornithidae - toucan-barbets (2 species, recently split from Capitonidae)
Family Capitonidae - American barbets (about 15 species)
Family Picidae - woodpeckers, piculets and wrynecks (over 200 species)