Roger Powell / Small flock of Brent Geese (Branta bernicla) in flight..Texel Island, The Netherlands, Europe

Roger Powell / Eurasian lynx (Lynx lynx) walking through snow. Captive, Bavarian Forest National Park, Bavaria, Germany. February.

Roger Powell / Rear view of Ruff (Philomachus pugnax) in full display at the lek. Varanger, Finmark, Norway, May.

Roger Powell / Satellite male Ruff (Philomachus pugnax) in full display at the lek. Varanger, Finmark, Norway, May.

Roger Powell / Pair of Montagu's harriers (Circus pygargus) undertaking a courtship food pass, Castro Verde, Alentejo, Portugal, April.

Roger Powell / Little owl (Athene noctua) perched on a fence post, stretching its wings, Castro Verde, Alentejo, Portugal, April.

Roger Powell / Little owl (Athene noctua) perched on a fence post, ruffling its feathers, Castro Verde, Alentejo, Portugal, April.

Roger Powell / Spanish imperial eagle (Aquila adalberti) perched on a rock and stretching its wings, Castro Verde, Alentejo, Portugal, April.

Roger Powell / Five Cattle egrets (Bubulcus ibis) in flight, Castro Verde, Alentejo, Portugal, April.

Roger Powell / Cattle egret (Bubulcus ibis) perched on the back of a sheep, with another on the ground, Castro Verde, Alentejo, Portugal, April.

Roger Powell / Two Buzzards (Buteo buteo) fighting over food in snow, Dransfeld, Hannover, Germany, January

Roger Powell / Carrion Crow (Corvus corone) tweaking the wing of a Buzzard (Buteo buteo) to try to get it to move off the food, Dransfeld, Hannover, Germany, January