Grouse are a group of birds from the order Galliformes. They are often considered a family Tetraonidae, though the American Ornithologists’ Union and many others include grouse as a subfamily Tetraoninae in the family Phasianidae.
Distribution / Range
Grouse inhabit temperate and subarctic regions of the northern hemisphere, from pine forests to moorland and mountainside, from 83° North (Ptarmigan in northern Greenland) to 28° North (Attwater’s Prairie Chicken in Texas). Presumably they evolved in this zone.
Description
Grouse are heavily built like other Galliformes such as chickens. They range in length from 31 cm (12 in) to 95 cm (37 in), in weight from 0.3 kg (11 oz) to 6.5 kg (14 lb).
Males are bigger than females—twice as heavy in the Capercaillie, the biggest member of the family. Grouse have feathered nostrils. Their legs are feathered to the toes, and in winter the toes too have feathers or small scales on the sides, an adaptation for walking on snow and burrowing into it for shelter. Unlike other Galliformes, they have no spurs.
Species
Genus Dendragapus
- Siberian Grouse, Dendragapus falcipennis
- Spruce Grouse, Dendragapus canadensis – probably distinct genus Canachites
- Franklin’s Grouse, Dendragapus (canadensis) franklinii
- Dusky Grouse, Dendragapus obscurus
- Sooty Grouse, Dendragapus fuliginosus
Genus Lagopus – ptarmigans
- Willow Grouse or Willow Ptarmigan, Lagopus lagopus
- Red Grouse Lagopus (lagopus) scoticus
- Ptarmigan or Rock Ptarmigan, Lagopus mutus
- White-tailed Ptarmigan, Lagopus leucura
Genus Tetrao – black grouse
- Eurasian Black Grouse, Tetrao tetrix
- Caucasian Black Grouse, Tetrao mlokosiewiczi
- Capercaillie, Tetrao urogallus
- Black-billed Capercaillie, Tetrao parvirostris
Genus Bonasa
- Hazel Grouses, Bonasa bonasia
- Severtzov’s Grouse, Bonasa sewerzowi
- Ruffed Grouses, Bonasa umbellus
Genus Centrocercus
- Greater Sage-Grouses, Centrocercus urophasianus
- Gunnison Sage-Grouses, Centrocercus minimus
Genus Tympanuchus – prairie grouse
- Sharp-tailed Grouse, Tympanuchus phasianellus
- Columbian Sharp-tailed Grouse, T. phasianellus columbianus
- Greater Prairie Chicken, Tympanuchus cupido
- Heath Hen, Tympanuchus (cupido) cupido (extinct, 1932)
- Lesser Prairie Chicken Tympanuchus pallidicinctus
Feeding and Habits
These birds feed mainly on vegetation—buds, catkins, leaves, and twigs—which typically account for over 95 percent of adults’ food by weight. Thus their diet varies greatly with the seasons.
Hatchlings eat mostly insects and other invertebrates, gradually reducing their proportion of animal food to adult levels.
Several of the forest-living species are notable for eating large quantities of conifer needles, which most other vertebrates refuse.
To digest vegetable food, grouse have big crops and gizzards, eat grit to break up food, and have long intestines with well-developed caeca in which symbiotic bacteria digest cellulose.
Forest species flock only in autumn and winter, though individuals tolerate each other when they meet. Prairie species are more social, and tundra species (ptarmigans, Lagopus) are the most social, forming flocks of up to 100 in winter. All grouse spend most of their time on the ground, though when alarmed, they may take off in a flurry and go into a long glide.
Most species stay within their breeding range all year, but make short seasonal movements; many individuals of the Ptarmigan (called Rock Ptarmigan in America) and Willow Grouses (called Willow Ptarmigan in America) migrate hundreds of kilometers.
Reproduction
In all but one species (the Willow Grouse), males are polygamous. Many species have elaborate courtship displays on the ground at dawn and dusk, which in some are given in leks (courtship/dancing grounds). The displays feature males’ bright-colored combs and in some species, bright-colored inflatable sacs on the sides of their necks.
The males display their plumage, give vocalizations that vary widely between species and may engage in other activities such as drumming or fluttering their wings, rattling their tails, and making display flights. Occasionally males fight.
The nest is a shallow depression on the ground, often in cover, with a scanty lining of plant material. The female lays one clutch but may replace it if the eggs are lost. She begins to lay about a week after mating and lays one egg every day or two; the clutch comprises 5 to 12 eggs.
The eggs have the shape of a hen’s eggs and are pale yellow, and sparsely spotted with brown. On laying the second-last or last egg, the female starts 21 to 28 days of incubation.
Chicks hatch in dense yellow-brown down and leave the nest immediately. They soon develop feathers and can fly a little before they are two weeks old. The female (and the male in the Willow Grouse) stays with them and protects them till their first autumn, by which time they reach their mature weight (except in the male capercaillies).
They are sexually mature the following spring but often do not mate until later years.
Populations
Grouse make up a considerable part of the vertebrate biomass in the Arctic and Subarctic. Their numbers may fall sharply in years of bad weather or high predator populations—significant grouse populations are a major food source for lynx, foxes, martens, and birds of prey. However, because of their large clutches, they can recover quickly.
The three tundra species have maintained their former numbers. The prairie and forest species have declined greatly because of habitat loss, though popular game birds such as the Red Grouses and the Ruffed Grouses have benefited from habitat management.
Most grouse species are listed by the IUCN as “least concern” or “near threatened”, but the Greater and Lesser Prairie-Chicken are listed as “vulnerable” and the Gunnison Sage-Grouses is listed as “endangered”. Some subspecies, such as Attwater’s Prairie-Chicken and the Cantabrian Capercaillie, and some national and regional populations are also in danger.
In culture
Grouse are game, and hunters kill millions each year for food and sport. The male Black Grouse‘s tail feathers are a traditional ornament for hats in areas such as Scotland and the Alps. Folk dances from the Alps to the North American prairies imitate the displays of lekking males.
