Species Profile
Western Capercaillie
Tetrao urogallus
Quick Facts
Conservation
LCLeast ConcernAlso known as: Wood Grouse, Capercaillie
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Appearance
The Western Capercaillie is a large, ground-dwelling grouse with striking sexual dimorphism. Males are predominantly black with a glossy blue-green sheen on the chest, a distinctive red eyebrow, and a large, fan-shaped tail. On the chin and throat area, spiky black feathers give the appearance of a beard.
Females are significantly smaller and sport mottled brown plumage with barring, providing excellent camouflage. Both sexes have feathered legs and feet, an adaptation to their cold habitat, and short, thick, hooked bills.
Identification & Characteristics
Male Colors
- Primary
- Black
- Secondary
- Green
- Beak
- Grey
- Legs
- Grey
Female Colors
- Primary
- Brown
- Secondary
- Buff
- Beak
- Grey
- Legs
- Grey
Female Markings
Barred plumage with rusty breast
Attributes
Understanding Attributes
Rated 0–100 based on research and observation. A score of 50 is average across all bird species. These attributes are relative and don't necessarily indicate superiority.
Habitat & Distribution
Western Capercaillies inhabit boreal and montane coniferous forests across Eurasia, from Scotland and Scandinavia to eastern Siberia. They prefer mature forests with a diverse understory and open areas for lekking.
In the UK, they are now restricted to the Scottish Highlands, where reintroduction efforts have had limited success. Their range has contracted significantly due to habitat loss and fragmentation.
Distribution
Diet
Western Capercaillies have a varied diet that changes seasonally. In winter, they primarily feed on conifer needles, especially pine. During spring and summer, they consume leaves, buds, berries, and insects.
Their specialised digestive system allows them to process tough plant material efficiently.
Behaviour
Western Capercaillies are known for their elaborate courtship displays. Males perform a complex ritual on traditional leks, fanning their tails and making distinctive clicking and popping sounds.
They are generally solitary outside the breeding season, foraging on the ground and roosting in trees at night.
Calls & Sounds
Male Western Capercaillies produce a series of distinctive sounds during their courtship display. This includes a loud 'pop' or 'cork' sound, followed by a scraping noise often described as 'crushing gravel'. Females make soft clucking calls. Both sexes may produce alarm calls when disturbed.
Nesting & Breeding
The breeding season for Western Capercaillies begins in late March to early April. Males gather at traditional lekking sites to perform elaborate courtship displays, competing for female attention.
Females construct simple ground nests in dense vegetation, often at the base of a tree. They typically lay 6-8 pale yellow or buff-coloured eggs with brown spots. The nest is a shallow scrape lined with plant material and feathers.
Incubation lasts about 26-29 days, carried out solely by the female. Chicks are precocial and can leave the nest shortly after hatching, staying with the hen for several months.
Conservation
While globally listed as Least Concern, Western Capercaillies face regional declines due to habitat loss and fragmentation.
In the UK, they are critically endangered, with conservation efforts focused on habitat management and predator control in Scotland.
Birdwatching Tips
- Look for Western Capercaillies in mature coniferous forests, especially those with a mix of pine and spruce.
- Listen for the distinctive 'cork-popping' sound of males during the spring breeding season.
- Be patient and quiet; these birds are shy and easily disturbed.
- In the UK, focus on the Scottish Highlands, where small populations persist.
Did You Know?
- The Western Capercaillie is the largest member of the grouse family.
- Males can weigh up to four times more than females, one of the most extreme size differences in birds.
- Their scientific name, Tetrao urogallus, means 'tail-cock' in Greek, referring to their impressive tail display.
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