Claudio Contreras / Californian sea lion (Zalophus californianus) swimming in Southern sea palm (Eisenia arborea) and Giant Kelp (Macrocystis pyrifera) forest, San Benitos Islands, Baja California Pacific Islands Biosphe...

Alex Mustard / Southern stingray (Dasyatis americana) two swimming over sand bar, under stormy sky. Grand Cayman, Cayman Islands. British West Indies.

Theo Bosboom / Rocks and sea stacks in the surf at Playa del Silencio in Asturias on the Northwest coast of Spain. May 2015

Theo Bosboom / Aerial of patterns of receding waves, Playa del Silencio, Asturias, Spain. April 2018

Theo Bosboom / Sea stacks consisting of flysch rock battered by the incoming tide, playa de Gueirua, Asturias, Northwest Spain. October 2015

Theo Bosboom / Sand patterns at sunrise, Praia da Adraga, Sintra, Portugal. December 2016

Jordi Chias / Chinstrap penguin (Pygoscelis antarcticus) carcass after leopard seal attack, Antarctic Peninsula, Antarctica.

Jordi Chias / Humped rockcod (Gobionotothen gibberiformis), Antarctic Peninsula, Antarctica.

Jordi Chias / Black rockcod (Notothenia coriiceps), Antarctic Peninsula, Antarctica.

Jordi Chias / Jellyfish (Diplulmaris antarctica) Cuverville, Antarctic Peninsula, Antarctica.

Jordi Chias / Crocodile icefish or White-blooded fish (Channichthyidae), Antarctic Peninsula, Antarctica.

Jordi Chias / Crabeater seals (Lobodon carcinophaga) resting on ice floating ice sheet, Antarctic Peninsula, Antarctica.

Jordi Chias / Rock cod (Notothenia) Antarctic Peninsula, Antarctica.

Jordi Chias / Primnoella soft coral, Antarctic Peninsula, Antarctica.

Jordi Chias / Sponge (Mycale acerata) with diver. Lermaire strait, Antarctic Peninsula, Antarctica.

Jordi Chias / Black rockcod (Notothenia coriiceps), Antarctic Peninsula, Antarctica.

Jordi Chias / Antarctic fur seal (Arctocephalus gazella), Antarctic Peninsula, Antarctica.

Jordi Chias / Crabeater seals (Lobodon carcinophaga), Antarctic Peninsula, Antarctica.

Jordi Chias / Humpback whale (Megaptera novaeangliae) spyhopping, Antarctic Peninsula, Antarctica.

Jordi Chias / Leopard seal (Hydrurga leptonyx) with mouth open, Antarctic Peninsula, Antarctica.

Jordi Chias / Leopard seal (Hydrurga leptonyx), Antarctic Peninsula, Antarctica.

Jordi Chias / Leopard seal (Hydrurga leptonyx) swimming underwater, Antarctic Peninsula, Antarctica.

Jordi Chias / Leopard seal (Hydrurga leptonyx) swimming, Antarctic Peninsula, Antarctica.

Jordi Chias / Gentoo penguins (Pygoscelis papua) porpoising, swimming together in search of krill, Antarctic Peninsula, Antarctica.

Jordi Chias / Leopard seal (Hydrurga leptonyx) predating a Gentoo penguin (Pygoscelis papua) Antarctic Peninsula, Antarctica.

Jordi Chias / Weddell seal (Leptonychotes weddellii), Antarctic Peninsula, Antarctica.

Jordi Chias / Weddell seal (Leptonychotes weddellii), Antarctic Peninsula, Antarctica.

Jordi Chias / Weddell seal (Leptonychotes weddellii), Antarctic Peninsula, Antarctica.

Jordi Chias / Gentoo penguin (Pygoscelis papua) with chick, Port Charcot, Antarctic Peninsula, Antarctica.Antarctic Peninsula, Antarctica.

Jordi Chias / Humpback whale (Megaptera novaeangliae) fluke Antarctic Peninsula, Antarctica.

Jordi Chias / Humpback whale (Megaptera novaeangliae) diving, tail fluke, Antarctic Peninsula, Antarctica.

Jordi Chias / Humpback whale (Megaptera novaeangliae), adult and baby at surface, Antarctic Peninsula, Antarctica.

Milan Radisics / Aerial shot of yellow mineral sediments flowing into the Atlantic Ocean, near Stokkseyri, Southern Iceland, August 2018.

John Chan / California sea lion (Zalophus californianus) feeding on a Striped bass (Morone saxatilis), Southern California, USA.

Mark Carwardine / Aerial view Fin whales (Balaenoptera physalus) lunge-feeding in the southern Sea of Cortez (Gulf of California), Baja California, Mexico.

Mark Carwardine / Aerial view of Fin whale (Balaenoptera physalus) lunge-feeding, with throat pouch distended, southern Sea of Cortez (Gulf of California), Baja California, Mexico.

Mark Carwardine / Aerial view of Fin whale (Balaenoptera physalus) lunge-feeding, with mouth open and throat pouch distended, southern Sea of Cortez (Gulf of California), Baja California, Mexico.

Mark Carwardine / Aerial view Fin whales (Balaenoptera physalus) lunge-feeding in the southern Sea of Cortez (Gulf of California), Baja California, Mexico.

Mark Carwardine / Aerial view Fin whales (Balaenoptera physalus) lunge-feeding in the southern Sea of Cortez (Gulf of California), Baja California, Mexico.

Shane Gross / Invasive Lionfish (Pterois volitans) which have taken over and are wiping out native fish in the Atlantic ocean. The highest densities are in the northern gulf of Mexico. Destin, Florida, USA.

Shane Gross / Invasive Lionfish (Pterois volitans) which have taken over and are wiping out native fish in the Atlantic ocean. The highest densities are in the northern gulf of Mexico. Destin, Florida, USA.

David Gallan / Two Southern right whales (Eubalaena australis) playing in shallows, taken with drone, Tathra Beach, New South Wales, Australia, August.

Duncan Murrell / Coral formations at low tide in Prony Bay in the Southern Lagoon, Lagoons of New Caledonia: Reef Diversity and Associated Ecosystems UNESCO World Heritage Site. New Caledonia.

Juan Carlos Munoz / Griffon vulture (Gyps fulvus) landing on coast next to flock. Cantabria, Spain, March.

Alex Hyde / Southern Elephant Seal bull (Mirounga leonina) close up portrait, King Haakon Bay, South Georgia. November.

Alex Hyde / Southern Elephant Seals (Mirounga leonina) pup with mother. King Haakon Bay, South Georgia. November.

Alex Hyde / Colonies of King penguins (Aptenodytes patagonicus) and Southern Elephant Seals (Mirounga leonina) on beach at St. Andrews Bay, South Georgia. November.

Stefan Christmann / Cameraman Lindsay McCrae on ice overlooking Southern Ocean, filming for BBC Dynasties Penguin programme. Atka Bay, Antarctica. March 2017.

Stefan Christmann / Orca (Orcinus orca), two spyhopping in gap in sea ice. Atka Bay, Antarctica. January.

Pedro Narra / Bottlenose dolphin (Tursiops truncatus) porpoising, Sado Estuary, Portugal. October

Pedro Narra / Bottlenose dolphin (Tursiops truncatus) porpoising, Sado Estuary, Portugal. July

David Tipling / Snow petrel (Pagadroma nivea nivea) flying around Iceberg off South Georgia, Southern Ocean January

David Tipling / King penguin (Aptenodytes patagonicus) Trollheim South Georgia, January.

David Tipling / Wandering albatross (Diomedea exulans) Southern Ocean near South Georgia, November

Seth Patterson / A compilation of items found washed up along a half mile stretch of the high tide line of South Padre Island, Texas. October 2016. Some of the plastic bottles and bags of signs of nip marks from hun...

Jordi Chias / Potato cod (Epinephelus tukula) Zavora Coast, Mozambique, Indian Ocean.

Alex Mustard / Southern stingray (Dasyatis americana) swimming over sand in shallow water, split level photo with blue sky and clouds. The Sandbar, Grand Cayman, Cayman Islands. British West Indies. Caribbean Sea.

Theo Bosboom / Limpets (Patellidae) exposed at low tide on the coast of Playa de Ursa, Portugal. Finalist in the Animals in their Environment Category of the Wildlife Photographer of the Year Awards (WPOY) Competiti...

Richard Robinson / Snares crested penguin (Eudyptes robustus) on rock washed with sea surf, Snares (Tine Heke) Sub Antarctic Island Group, Southern Ocean, New Zealand. December 2016. Editorial use only.

Frederique Olivier / View of icebergs and pack ice at sunset, seen from a moving boat, Antarctica.

Frederique Olivier / Emperor penguin (Aptenodytes forsteri) tobogganing on an iceberg at sunset and diving from the edge, seen from a moving boat, Antarctica.

Konrad Wothe / Large group of South American sea lions (Otaria flavescens) swimming at the surface, Palomina Islands, Peru.

Ingo Arndt / Cape fur seals (Arctocephalus pusillus) at colony, Cape Cross, Namibia, December

Ingo Arndt / Antarctic Fur Seal (Arctocephalus gazella) bull on land, Stromness Bay, South Georgia Island, Southern Ocean, Antarctic Convergence, November 2008

Ingo Arndt / King penguin (Aptenodytes patagonicus) colony with adults and chicks. St Andrews Bay, South Georgia Island, Southern Ocean, Antarctic Convergence

Ingo Arndt / King Penguin (Aptenodytes patagonicus) plumage detail, St Andrews Bay, South Georgia Island, Southern Ocean, Antarctic Convergence.

Ingo Arndt / King Penguin (Aptenodytes patagonicus) portrait and plumage detail, St Andrews Bay, South Georgia Island, Southern Ocean, Antarctic Convergence.

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

Ingo Arndt / Gentoo penguin (Pygoscelis papua) calling, Stromness Bay, South Georgia Island, Southern Ocean, Antarctic Convergence.

Ingo Arndt / Gentoo penguins (Pygoscelis papua) walking to the beach, Stromness Bay, South Georgia Island, Southern Ocean, Antarctic Convergence. November

Ingo Arndt / Waves crashing against ice cliffs of iceberg off the southern tip of South Georgia Island in wind storm, Southern Ocean, Antarctic Convergence, November 2008

Rolf Nussbaumer / Kemp's ridley sea turtle (Lepidochelys kempii), baby turtle walking towards sea, South Padre Island, South Texas, USA. July

Cyril Ruoso / South American fur seal (Arctocephalus australis) coming up to beach from sea, Punta San Juan, Peru

Cyril Ruoso / South American fur seal (Arctocephalus australis) male head profile, Punta San Juan, Peru

Alex Mustard / California sea lion (Zalophus californianus) resting in the canopy of a forest of giant kelp (Macrocystis pyrifera). Santa Barbara Island, Channel Islands. Los Angeles, California, United States of Am...

Chris & Monique Fallows / Cape fur seal (Arctocephalus pusillus) porpoising, False Bay, Cape Town, South Africa, July.

Chris & Monique Fallows / Mako shark (Isurus oxyrinchus) with sunrays, Cape Point, South Africa, March.

Chris & Monique Fallows / Mako shark (Isurus oxyrinchus) near surface, Cape Point, South Africa, March 2015

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) predating Cape fur seal (Arctocephalus pusillus) Seal Island, False Bay, South Africa, July. Sequence 3 of 3

Chris & Monique Fallows / Orca (Orcinus orca) breaching whilst hunting Common dolphin, False Bay, South Africa, April.

Chris & Monique Fallows / Long-beaked common dolphin (Delphinus capensis) breaching in front of large ship during sardine run, East London, South Africa, June.

Alex Mustard / Young California sea lion (Zalophus californianus) playing in the canopy of a forest of Giant kelp (Macrocystis pyrifera). Santa Barbara Island, Channel Islands. California, USA. North East Pacific Oc...

Jordi Chias / Spotted catshark (Scyliorhinus canicula) just hatched from egg case that is on Seafan (Paramuricea clavata), Ullastres seamount, Costa Brava, Llafranch, Catalunya, Spain

Jordi Chias / Angular roughshark (Oxynotus centrina) a deepsea species living at 80-300m depth, caught by fishermen and released, Costa Brava, Catalunya, Spain, Mediterranean Sea

Jordi Chias / Split level view of Blue shark (Prionace glauca) at surface at sunset, Azores Islands, Portugal, Atlantic Ocean

Jordi Chias / Giant Manta (Manta birostris) with Remoras (Remora brachyptera) attached to both wings, offshore Santa Maria Island, Azores, Atlantic Ocean

Ann & Steve Toon / Ostrich (Struthio camelus) male standing in landscape, Table Mountain National Park, Western Cape, South Africa

Wim van den Heever / Bottlenose dolphin (Tursiops truncatus) porpoising at surface, Port St Johns, South Africa

Wim van den Heever / Table Mountain viewed from across the sea at sunset, Cape Town, South Africa

Wim van den Heever / Aerial view of Cape Town city with Table Mountain, South Africa, taken from helicopter, May 2011

Wim van den Heever / Aerial view of Cape Town city with Table Mountain, South Africa, taken from helicopter, May 2011

Wim van den Heever / Aerial view of Cape Town city with Table Mountain, South Africa, taken from helicopter, May 2011

Wim van den Heever / Bottlenose Dolphin (Tursiops truncates) mother and calf porpoising during annual Sardine run, Port St Johns, South Africa, June.

Luis Quinta / Fin whale (Balaenoptera physalus) near surface. Pico Island, Azores, Portugal. May.

Luis Quinta / Great shearwater (Puffinus gravis) in flight, Fonte da Telha Beach, Portugal, October.