Markus Varesvuo / Two male Black grouse (Tetrao / Lyrurus tetrix) fighting at lek. Utajarvi, Finland, April.

David Tipling / Red grouse (Lagopus lagopus) male in flight over Heather. Grinton Moor, above Swaledale, Yorkshire Dales National Park, England, UK. July.

David Tipling / Red grouse (Lagopus lagopus) male in flight. Grinton Moor, above Swaledale, Yorkshire Dales National Park, England, UK. July.

Markus Varesvuo / Black Grouse (Lyrurus tetrix) male displaying with bokeh effect in the foreground, Liminka, Finland, March

Markus Varesvuo / Black Grouse (Lyrurus tetrix) male displaying with bokeh effect in the foreground, Liminka, Finland, March

Sven Zacek / Black Grouse (Tetrao tetrix) two males facing off on a lekking site, Varumaa county, Southern Estonia. April.

George Sanker / Wild turkey (Meleagris gallopavo) male displaying during spring mating season. Acadia National Park, Maine, USA. April.

George Sanker / Wild turkey (Meleagris gallopavo) male displaying during spring mating season. Acadia National Park, Maine, USA. April.

Erlend Haarberg / Black grouse (Lyrurus tetrix), male calling early in the morning, Norway. May.

Erlend Haarberg / Rock ptarmigan (Lagopus muta) in flight, Tysfjorden, Nordland, Norway, March.

Markus Varesvuo / Hazel Grouse (Tetrastes bonasia), Kuusamo, Finland, December.

Markus Varesvuo / Goshawk (Accipiter gentilis) plucking a Willow Grouse (Lagopus lagopus) Liminka, Finland, March.

SCOTLAND: The Big Picture / RF - Black Grouse (Tetrao tetrix) male peforming flutter jump display on lek, Cairngorms National Park, Scotland, UK.May (This image may be licensed either as rights managed or royalty free.)

SCOTLAND: The Big Picture / RF - Black Grouse (Tetrao tetrix), two males fighting on lek , Scotland, UK.April (This image may be licensed either as rights managed or royalty free.)

Staffan Widstrand / Grey francolin (Francolinus pondicerianus) Keoladeo Ghana National Park, Bharatpur, Rajasthan, India

Staffan Widstrand / Indian peafowl or blue peafowl (Pavo cristatus) Keoladeo Ghana National Park, Bharatpur, Rajasthan, India

Marie Read / California quail (Callipepla californica), male emerging from behind snowbank in winter, Mono Lake Basin, California, USA

Jed Weingarten / Wild Wonders of China / Temminck's tragopan (Tragopan temminckii) Tangjiahe Nature Reserve, Sichuan province, China.

Andy Sands / Grey partridge (Perdix perdix) three birds on snow covered mound, Bedfordshire, England, UK, December

Loic Poidevin / Red-legged partridge (Alectoris rufa) with chicks, Vendee, France, June

Ernie Janes / Pheasant (Phasianus colchicus) male flying to roost at sunset with trees silhouetted in background England, UK. December.

Staffan Widstrand / Wild Wonders of China / Golden pheasant (Chrysolophus pictus) male jumping, Yangxian Biosphere Reserve, Shaanxi, China

Sergey Gorshkov / Black Grouse (Tetrao tetrix) males fighting at lek in the snow, Tver, Russia. April

Konrad Wothe / Pheasant (Phasianus colchicus) male calling, East Frisian Islands, Wittbulten National Park. Wadden Sea UNESCO World Heritage Site, Germany, June.

Staffan Widstrand / Wild Wonders of China / Golden pheasant (Chrysolophus pictus) male displaying in grass in Yangxian Nature Reserve, Shaanxi, China, September.

Staffan Widstrand / Wild Wonders of China / Red jungle fowl (Gallus gallus) Tongbiguan Nature Reserve, Dehong Prefecture, Yunnan Province, China, April.

Espen Bergersen / Ptarmigans (Lagopus mutus) in white winter plumage, camouflaged against mountain scree with snow, Spitsbergen, Svalbard, Norway, April

Espen Bergersen / Ptarmigans (Lagopus mutus) in white winter plumage, camouflaged against mountain scree with snow, Spitsbergen, Svalbard, Norway, April. Highly commended in the Animals in their Environment Category of...

Wim van den Heever / Bare-faced curassow (Crax fasciolata) portrait of female, Pantanal, Brazil.

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.

Markus Varesvuo / Four Grey partridges (Perdix perdix) on snow, Kauhajoki, Finland, January.

Markus Varesvuo / Willow grouse / Ptarmigan (Lagopus lagopus) fluffed up perched in snow, Inari, Finland, February.

Markus Varesvuo / Male Capercaillie (Tetrao urogallus) flying, Jalasjarvi, Finland, April.

Markus Varesvuo / Male Capercaillie (Tetrao urogallus) display jumping, Vaala, Finland, May.

Markus Varesvuo / Willow grouse (lagopus lagopus) flock in flight in snow, Utsjoki, Finland, October.

Markus Varesvuo / Capercaillie (Tetrao urogallus) chicks huddled together, Kuhmo, Finland, June.

Markus Varesvuo / Male Black grouse (Tetrao / Lyrurus tetrix) flying, Utajarvi, Finland, April.