The Capercaillie bird (Tetrao urogallus) is also known as the Wood Grouse or Western Capercaillie. It is the largest member of the grouse family, reaching over 100 centimetres in length and 4 kilograms in weight. Found across northern Europe and Asia, it is renowned for its unique mating display. Males are called ‘cocks’ and females are called ‘hens’. Find out more!