Largest species of grouse

The world’s largest species of grouse is the capercaillie Tetrao urogallus, native to northern European pine forests. Adult males are black or very dark grey and weigh up to 4 kg (8 lb 13 oz), adult females are brown and weigh up to around 2 kg (4 lb 6 oz). It became extinct in Scotland during the 17th century, but was successfully reintroduced from Sweden during the 1830s.