Christophe Courteau / Black heron (Egretta ardesiaca) spreads its wings on the Okavango Detla, Botswana. The birds' wings form an umbrella over the water so they can see and hunt fish more easily

Juan Carlos Munoz / Black-crowned Night Heron (Nycticorax nycticorax) portrait. Everglades National Park, Florida, USA, February.

Bence Mate / Great egret (Ardea alba) drops a fish from its beak and a Black headed gull (Larus ridibundus) flies in to catch it. Lake Csaj, Kiskunsagi NP, Hungary, January. Winner, Eric Hosking award, 2011 Wildli...

Laurent Geslin / Grey heron (Ardea cinerea) portrait in urban park, Paris. France, November.

Laurent Geslin / Grey heron (Ardea cinerea) perched on stone wall in urban park, with people walking behind, Paris. France, November.

Wild Wonders of Europe / Máté / Grey heron (Ardea cinerea) and a Black stork (Ciconia nigra) in water, Fisher pond, Prypiat area, Belarus, June 2009

Wild Wonders of Europe / Widstrand / Night heron (Nycticorax nycticorax) on branch, Lake Kerkini, Macedonia, Greece, May 2009

Mitsuaki Iwago / Black Rhinoceros (Diceros bicornis) grazing in grassland surrounded by a flock of Cattle Egrets (Bubulcus ibis), Ngorongoro Crater, Tanzania

Mitsuaki Iwago / Black Rhinoceros (Diceros bicornis) with Cattle Egret (Bubulcus ibis) on its back, Ngorongoro Crater, Tanzania

Konrad Wothe / Black-crowned Night Heron (Nycticorax nycticorax) calling, Europe

Juan Manuel Borrero / Illustration of tracks of the Pyrenean animals, Roe deer (Capreolus capreolus), Red deer (Cervus elaphus), Pyrenean chamois (Rupicapra pyrenaica), Brown bear (Ursus arctos), Red squirrel (Sciurus vulg...

Juan Manuel Borrero / Illustration of silhouettes of the Pyrenean animals, Roe deer (Capreolus capreolus), Red deer (Cervus elaphus), Pyrenean chamois (Rupicapra pyrenaica), Red squirrel (Sciurus vulgaris), Red fox (Vulpes...