Bence Mate / Grey heron (Ardea cinerea) close up of feathers, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary, February.

Lou Coetzer / Pintailed whydah (Vidua macroura) male displaying to female, Masai Mara, Kenya.

Michel Poinsignon / Great white egret (Egretta alba) preening feathers, Pusztaszer, Hungary, April

Michel Poinsignon / Great white egret (Egretta alba) detail of plumage and legs from the front, Pusztaszer, Hungary, April

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

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

Markus Varesvuo / Golden eagle (Aquila chrysaetos) plucking Capercaillie (Tetrao urogallus) Kuusamo, Finland, April.

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

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

Melvin Grey / Violet-tailed sylph hummingbird (Aglaiocercus coelestis) hummingbird adult male, approaching flower to feed, Tandayapa, Ecuador

Gerrit Vyn / Snowy Owl (Bubo scandiacus) fluffing feathers, this image was taken during a massive increase in the range and population of snowy owls. Boundary Bay, Canada. March.

Bence Mate / Great egret (Ardea alba) close up of feathers, Lake Csaj, Pusztaszer, Hungary, December. Winner of the Portfolio category of the Terre Sauvage Nature Images Awards competition 2015.