Pete Oxford / Pair of Magellan cormorants / Rock shags (Phalacrocorax magellanicus) on nest, Falkland Islands

Nigel Bean / Northern gannets mating behaviour, preening and grooming {Morus bassanus} Bass Rock Scotland

Michael W. Richards / Shag {Phalacrocorax aristotelis} courtship display while nest building Scotland UK

Gabriel Rojo / Red legged cormorant pair + juvenile at cliff nest, Patagonia, Argentina

Gabriel Rojo / Red legged cormorant pair with juvenile at cliff nest, Patagonia, Argentina

Gabriel Rojo / Red legged cormorant pair + juvenile at cliff nest, Patagonia, Argentina

Gabriel Rojo / Red legged cormorant pair with juvenile at cliff nest, Patagonia, Argentina

Gabriel Rojo / Red legged cormorant pair + juvenile at cliff nest, Patagonia, Argentina

Gabriel Rojo / Red legged cormorant {Phalacrocorax gaimardi} adult pair with chick at cliff nest, Patagonia, Argentina

David Kjaer / Fulmar pair on nest ledge {Fulmarus glacialis} Sutherland, Scotland, UK.

David Kjaer / Atlantic puffin greeting display {Fratercula arctica} Farne Islands, England.

Pete Oxford / Red and Green Macaw (Ara chloroptera) pair flying, Cerrado habitat, Mato Grosso do Sul, Brazil

Winfried Wisniewski / Snow Goose (Chen caerulescens) pair landing, North America

Winfried Wisniewski / Bat-eared Fox (Otocyon megalotis) pair, Africa

Duncan Usher / Mute Swan (Cygnus olor) pair flying, Europe

Yva Momatiuk & John Eastcott / African Lion (Panthera leo) pair of cubs walking together following African Lionesses of their pride, Masai Mara National Reserve, Kenya

Jim Brandenburg / Douglas Fir (Pseudotsuga menziesii) pair reaching towards the sky, Bryce Canyon National Park, Utah

Sumio Harada / Mountain Goat (Oreamnos americanus) pair on snowy mountain slope, Rocky Mountains, North America

Konrad Wothe / Whooper Swan (Cygnus cygnus) pair flying, Kussharo-ko, Hokkaido, Japan

Konrad Wothe / Hyacinth Macaw (Anodorhynchus hyacinthinus) pair flying, Pantanal, Brazil

Jim Brandenburg / Arctic Wolf (Canis lupus) stalking Muskox (Ovibos moschatus) pair in defensive formation, Ellesmere Island, Nunavut, Canada

Tui De Roy / Hooker's Sea Lion (Phocarctos hookeri) pair of three month old pups playing in peat wallow while mothers are away, Enderby Island, Auckland Islands, New Zealand

Jim Brandenburg / Giraffe (Giraffa sp) pair silhouetted at sunset, native to Africa

Jim Brandenburg / Snow Goose (Chen caerulescens) pair flying, California

Jim Brandenburg / Siberian Crane (Grus leucogeranus) pair flying, China

Jim Brandenburg / Tundra Swan (Cygnus columbianus) pair flying, Mattamuskeet National Wildlife Reserve, North Carolina

Flip Nicklin / Orca (Orcinus orca) pair surfacing, British Columbia, Canada

Ben Osborne / Kittiwakes mating at nest site {Rissa tridactyla} Talan Is, Okhotsk Sea, E Russia

Patricio Robles Gil / Kittiwake + chick at nest on cliff {Rissa tridactyla} Iceland

Patricio Robles Gil / Kittiwake pair at nest on cliff {Rissa tridactyla} Iceland

David Kjaer / Fulmar pair at nest site on cliffs, Sutherland, Scotland, UK.

Tom Vezo / Least auklet pair. {Aethia pusilla} St Paul Is, Alaska, USA Pribilofs

Tom Vezo / Horned puffins. Pair. {Fratercola corniculata} Summer St Paul Is, Alaska, USA Pribilof.

Tom Vezo / Horned puffin pair, St Paul Island, Alaska, USA

DAVID TIPLING / Horned puffins at nest site, St Paul's Is, Pribilof Islands, Alaska

Brian Lightfoot / Shag nesting on cliff ledge {Phalacrocorax aristotelis} May Is, Scotland, UK

Brian Lightfoot / Shag pair on cliff ledge {Phalacrocorax aristotelis} May Is, Scotland, UK

DAVID TIPLING / Horned puffin pair, St Paul's Island, Pribilof Islands, Alaska

Richard Du Toit / Burchell's Zebra (Equus burchellii) pair facing each other, Rietvlei Nature Reserve, Gauteng, South Africa

Richard Du Toit / White Rhinoceros (Ceratotherium simum) pair grazing, Rietvlei Nature Reserve, Gauteng, South Africa

Tui De Roy / White Rhinoceros (Ceratotherium simum) pair grazing, Solio Ranch, Kenya

Pete Oxford / King Penguin (Aptenodytes patagonicus) pair, Volunteer Point, East Falkland Island, Falkland Islands

Peter Lewis / Pair of Herring Gulls (Larus argentatus) on West Bay cliffs, Dorset.

Pete Oxford / Hyacinth macaw pair in cliff nest hole {Anodorhynchus hyacinthinus} Pantanal, Brazil

Steve Knell / Sand martin {Riparia riparia} pair at nest hole, Czech rebublic

Gabriel Rojo / Red legged cormorant {Phalacrocorax gaimardi} adult pair with chick at nest on cliff ledge, Patagonia, Argentina

Konrad Wothe / Mute Swan (Cygnus olor) pair feeding and diving, Europe

Ben Osborne / Kittiwakes mating at nest site {Rissa tridactyla} Talan Is Okhotsk Sea E Russia

Steve Knell / Sand martin pair with young at nest hole {Riparia riparia} Czech republic