Markus Varesvuo / Hoopoe (Upupa epops) male giving mating gift to female, Hungary May

Markus Varesvuo / Japanese / Red-crowned crane (Grus japonicus) two calling and dancing, part of bonding and courtship display, Hokkaido Japan February

Markus Varesvuo / Japanese / Red-crowned crane (Grus japonicus) two calling, part of bonding and courtship display, Hokkaido Japan February

Markus Varesvuo / Snowy owl (Bubo scandiaca) female face close up, Canada February

Markus Varesvuo / Steller's sea eagle (Haliaeetus pelagicus) fighting over food with White-tailed eagle (Haliaeetus albicilla) Hokkaido Japan February

Markus Varesvuo / Whooper swans (Cygnus cygnus) three coming into land, Hokkaido, Japan, February

David Tipling / Bearded vulture (Gypaetus barbatus) adult swallowing leg bone along with hoof, Spanish Pyrenees, July. This bird swallowed five of these leg bones whole, they have the ability to dissolve the bone in...

David Tipling / Southern elephant seal (Mirounga leonina) female asleep on beach, close up of head, St Andrews Bay, South Georgia January

David Tipling / Wandering albatross (Diomedea exulans) pair displaying at dusk in ritual bonding behaviour, Albatross Island in Bay of Isles, South Georgia January

David Tipling / King penguins (Aptenodytes patagonicus) pair interacting, part of courtship, Gold Harbour South Georgia, January

Yashpal Rathore / Deccan ground gecko (Cyrtodactylus albofasciatus) , backlit on leaf. Amboli, Maharashtra, India. Endemic to Western Ghats.

Yashpal Rathore / Jayarami Bush frog (Raorchestes jayarami), inflating vocal sac, calling to attract mate, Anamalai Wildlife Sanctuary, India. Endemic to Western Ghats.