Peter Bassett / King penguin (Aptenodytes patagonicus), Salisbury Plain, South Georgia.

Peter Bassett / King penguins (Aptenodytes patagonicus) preening in breeding colony, with mountains in the background, Salisbury Plain, South Georgia.

Frederique Olivier / Close-up of a dominant male Southern elephant seal (Mirounga leonina) calling, Macquarie Island, Sub-Antarctic Australia.

Ingo Arndt / Tisza mayfly (Palingania longicauda) hanging on branch and moulting, River Tisza, Hungary, June

Ingo Arndt / Mayfly (Palingenia longicauda) hanging on leaf and moulting, Tisza river, Hungary, sequence 5/7, June

Ingo Arndt / Mayfly (Palingenia longicauda) hanging on leaf and moulting, Tisza river, Hungary, sequence 6/7, June

Ingo Arndt / Mayfly (Palingenia longicauda) hanging on leaf and moulting, Tisza river, Hungary, sequence 3/7, June

Ingo Arndt / A large group of King Penguin (Aptenodytes patagonicus) moulting, St Andrews Bay, South Georgia Island, Southern Ocean, Antarctic Convergence.

Tony Wu / Group of Sperm whales (Physter macrocephalus) family group swimming together, Indian Ocean, March.

Tony Wu / Sperm whales (Physeter macrocephalus) large group gathering together, rubbing together to shed skin, interacting and defecating. Indian Ocean, March.

Tony Wu / Family of Sperm whales (Physeter macrocephalus) engaged in social activity, rubbing against each other, Indian Ocean, March.

Tony Wu / Aggregation of Sperm whales (Physeter macrocephalus) engaged in social activity. Indian Ocean, March.