Photo, picture:
Birkhuehner zeigen ein unverwechselbares Balzverhalten - (Birkhahn - Foto Birkhahn bei der Gefiederpflege)
Black Grouse have a very distinctive and well-recorded courtship ritual - (Blackcock - Photo Black Grouse cock in a pine tree preening)
Lyrurus tetrix - Tetrao tetrix

Gallery overview