What is the largest member of the grouse family?

The largest member of the grouse family is the capercaillie (Tetrao urogallus). Native to the forests of Europe and parts of Asia, males can weigh up to 4 kg (about 8.8 lbs) and have a wingspan of up to 85 cm (33 inches). Known for their impressive courtship displays, capercaillies are primarily ground-dwelling birds that prefer coniferous forests. Their size and distinctive plumage make them a notable species within the grouse family.