Jan Wegener/ BIA / Grey Heron (Ardea cinerea) spreading wings on frozen lake, Berlin, Germany

Bence Mate / Group of Great egrets (Ardea alba) reflected in still water, with Hooded crows (Corvus cornix), Lake Csaj, Pusztaszer, Hungary. Winner of the Portfolio category of the Terre Sauvage Nature Images Awar...

Danny Green / Whooper swans (Cygnus cygnus) two in flight, during snowfall, Lake Kussharo, Japan, February

Claudio Contreras / Waterfowl at dawn with mist, including Great blue heron (Ardea herodias herodias), American avocet (Recurvirostra americana), Northern shoveler (Anas clypeata), Xochimilco wetlands, Mexico City, Mexic...

David Pattyn / Dalmatian pelican (Pelecanus crispus) taking off from water, Lake Kerkini, Greece. February. Vulnerable species.

Olga Kamenskaya / Young Baikal seal (Pusa sibirica) at breathing hole. Lake Baikal, Russia, April.

Olga Kamenskaya / Young Baikal seal (Pusa sibirica) at breathing hole. Lake Baikal, Russia, April.

Pascal Tordeux / Fisherman on Lake Old Forge, Ardennes, France, November 2011. Model released

Mary McDonald / Flock of Gray-headed Gulls (Chroicocephalus cirrocephalus) flying over Lake Nakuru, Kenya, East Africa

Flip Nicklin / Amazon River Dolphin (Inia geoffrensis) rescued from drying irrigation ditch off the Orinoco River, Lago De Prata, Brazil

Jim Brandenburg / Timber Wolf (Canis lupus) walking on frozen lake, Minnesota

Jim Brandenburg / Timber Wolf (Canis lupus) running across frozen Kawishiwi Lake, Minnesota