The family Tetraonidae, commonly known as grouse, includes medium to large birds found primarily in the Northern Hemisphere. These birds are adapted to cold environments and are often associated with forested or open habitats. Grouse are known for their distinctive courtship displays and elaborate plumage, which varies among species. Tetraonidae encompasses several genera, including Bonasa (ruffed grouse) and Lagopus (ptarmigans). Many species within this family are ground-dwelling and rely on camouflage for protection from predators. Grouse are also important game birds, contributing to hunting traditions in various cultures.