Donald M. Jones / Ruffed Grouse (Bonasa umbellus) in defensive display, Yaak, Montana

Donald M. Jones / Blue Grouse (Dendragapus obscurus) male displaying, western Montana

Johannes Melchers/ BIA / Caucasian Grouse (Tetrao mlokosiewiczi) male, Georgia

SCOTLAND: The Big Picture / Capercaillie (Tetrao urogallus) feeding in a Scots pine tree (Pinus sylvestris), Cairngorms National Park, Scotland, UK, February.

SCOTLAND: The Big Picture / Two male Black grouse (Tetrao tetrix) displaying at a lek, Cairngorms National Park, Scotland, UK, April.

Markus Varesvuo / Female Capercaillie (Tetrao urogallus) with newly hatched chick on nest, Kuhmo, Finland, June.

Markus Varesvuo / Female Capercaillie (Tetrao urogallus) ready to mate, Vaala, Finland, May.

Markus Varesvuo / Willow grouse / Ptarmigan (Lagopus lagopus) pecking twig, Utsjoki, Finland, April.

Markus Varesvuo / Female Black grouse (Tetrao / Lyrurus tetrix) perched in tree covered in snow, Inari Kiilopaa, Finland, January.

Markus Varesvuo / Black grouse (Tetrao / Lyrurus tetrix) flock flying in snow, Suomussalmi, Finland, January.

Markus Varesvuo / Female Black grouse (Tetrao / Lyrurus tetrix) perched in Willow feeding, Utajarvi, Finland, May.

Markus Varesvuo / Male Hazel grouse (Tetrastes / Bonasa bonasia) portrait, Kuusamo, Finland, June.