Eladio Fernandez / Blue-headed quail-dove (Starnoenas cyanocephala) profile, Cuba. Endangered species. Endemic.

Karine Aigner / Blue-headed quail-dove (Starnoenas cyanocephala) on ground, Cuba

Tomasz Zawadzki/ BIA / Blue-headed Wagtail (Motacilla flava) calling, Poland

Alex Mustard / Great hammerhead shark (Sphyrna mokarran) female at night with Bar jacks (Caranx ruber), South Bimini, Bahamas. The Bahamas National Shark Sanctuary. Gulf Stream, West Atlantic Ocean.

Floris van Breugel / Bald eagle (Haliaeetus leucocephalus) flying in front of the massive wall of ice, Margerie Glacier, Glacier Bay National Park, Alaska, USA, August 2014.

Richard Robinson / Maui's dolphin (Cephalorhynchus hectori maui) Critically Endangered, the world's smallest and rarest marine dolphin. Endemic to North Island, New Zealand. October. Editorial use only.

Richard Robinson / Hector's dolphin (Cephalorhynchus hectori) Akaroa Harbour, South Island, New Zealand, November. Editorial use only.

Richard Robinson / Maui's dolphins (Cephalorhynchus hectori maui) Critically Endangered, the world's smallest and rarest marine dolphin. Endemic to North Island, New Zealand, March. Editorial use only.

Ben Hall / Black-headed gull (Larus ridibundus) alighting on water at dawn, Cheshire, UK, November. Highly Commended in the British Wildlife Photography Awards (BWPA) competition 2013.

Christophe Courteau / Whale headed / Shoebill stork (Balaeniceps rex) in flight over the swamps of Mabamba, Lake Victoria, Uganda / Bec en sabot, Lac Victoria, Ouganda

Doug Gimesy / Trees with Grey-headed flying-foxes (Pteropus poliocephalus) hang in them. Yarra Bend Park. Kew, Victoria, Australia. November 2019.

Peter Lewis / Mediterranean gull (Larus melanocephalus) in Summer plumage in flight, Hayling Island, Hampshire, England, UK.