Capercaillie

Tweet of the Day is a series of fascinating stories about our British birds inspired by their calls and songs. Kate Humble presents the capercaillie. The bizarre knife-grinding, cork-popping display of the male capercaillie is one of the strangest sounds produced by any bird. The name 'Capercaillie' is derived from the Gaelic for 'horse of the woods', owing to the cantering sound, which is the start of their extraordinary mating display. These are the largest grouse in the world and in the UK they live only in ancient Caledonian pine forests.