Families overview for this order
- Medium-sized to large terrestrial birds with large, powerful legs and feet and sharp claws.
- Australasian Region, with greatest diversity in Australo-Papuan Subregion; lone outpost in Oriental Region.
- Tropical forest, mostly in lowlands; one species occupies semi-arid woodland and scrub.
- Medium-sized to large long-tailed gallinaceous birds with predominantly arboreal habits.
- Neotropical Region and extreme S Nearctic.
- Forests, open woodlands and scrub, from sea-level up to 3900 m.
- Medium-sized, plump terrestrial birds, with small head, and extensive bare skin on head and neck; most species with crest or bony casque.
- Afrotropical Region.
- Wide variety of habitats, from dense rain forest to semi-desert.
- Fairly small terrestrial birds with compact body, strong legs, and short wings.
- Neotropical and Nearctic Regions.
- Tropical, subtropical and temperate forests, forest edge, savanna and agricultural land, from sea-level to 3300 m.
Includes, in Tetraonini, all taxa that have commonly been separated in families Meleagrididae and Tetraonidae.
- Small to large terrestrial birds, with plump body, short, stout bill, short, rounded wings and short or very long tail; plumage drab or spectacular.
- Old World, with greatest diversity in SE Asia and Africa.
- Open areas or forest, from sea-level up to snow-line.