Pheasants; turkeys; grouse; partridges; quails; chickens; brush turkeys; curassows; hoatzins WordNet 3.0

Pheasants, turkeys, grouse, partridges, quails, chickens, brush turkeys, curassows, hoatzins Open English WordNet

Galliformes is an order of heavy-bodied ground-feeding birds that includes turkeys, chickens, quail, and other landfowl. Wikipedia

The order of birds that includes grouse, ptarmigan, capercaillie, partridges, pheasants, quails, turkeys and peacocks. These are mainly grain-eating, heavy-bodied, ground-nesting birds, capable of only short, rapid flights. The cocks are usually more colourful than the hens. OmegaWiki