Stefan Christmann / Weddell seal (Leptonychotes weddellii) female hauled out with pup, Atka Bay, Queen Maud Land, Antarctica. October.

Franco Banfi / California sealion (Zalophus californianus) swimming. Magdalena Bay, Baja California Sur, Pacific Ocean, Mexico

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.

Sebastian Kennerknecht / Harbor Seal (Phoca vitulina) pup, Elkhorn Slough, Monterey Bay, California

Sebastian Kennerknecht / Harbor Seal (Phoca vitulina) pup, Elkhorn Slough, Monterey Bay, California

Dave Watts / Two female Australian sea lions (Neophoca cinerea) playing and interacting on a beach, with others nearby, Seal Bay Conservation Area, Kangaroo Island, South Australia.

Dave Watts / Female Australian sea lion (Neophoca cinerea) scratching and rolling on a beach, Seal Bay Conservation Area, Kangaroo Island, South Australia.

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

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

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

Wim van den Heever / South African fur seal (Arctocephalus pusillus pusillus) bull breaking apart octopus. False Bay, Cape Town, South Africa.

Cheryl-Samantha Owen / Great white shark (Carcharodon carcharias) breaching, at decoy seal, Seal Island, False Bay, off the coast of Cape Town, South Africa. July.

Wim van den Heever / South African fur seal (Arctocephalus pusillus pusillus) with setting sun, Walvis Bay, Namibia.

Suzi Eszterhas / Harbor Seal (Phoca vitulina) mother and pup nuzzling, Monterey Bay, California

Solvin Zankl / Brown hyena (Hyaena brunnea) stalking fur seal (Arctocephalus pusillus) pup, Sperrgebiet National Park, Namibia, December. Sequence 1/8

Solvin Zankl / Black backed jackal (Canis mesomelas) attacking Cape fur seal (Arctocephalus pusillus) pup, Sperrgebiet National Park, Namibia, December. Sequence 3/6

Sean Crane / Polar Bear (Ursus maritimus) at sunrise, Hudson Bay, Seal River, Manitoba, Canada

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Cape fur seal (Arctocephalus pussilus) portrait, at water surface, Seal Island, False Bay, Cape Town, South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) near surface, Seal Island, False Bay, South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) feeding on Brydes whale carcass (Balaenoptera brydei), Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) feeding on Brydes whale carcass (Balaenoptera brydei), Seal Island, False Bay South Africa.

Chris & Monique Fallows / Split level shot of Great white shark (Carcharodon carcharias) fin above the water and leisure boat in the background, with Seal Island, False Bay, South Africa.

Inaki Relanzon / Australian Sea Lion (Neophoca cinerea) sitting on beach with one flipper up, Seal Bay Conservation Park, Kangaroo Island, South Australia State, Australia.

Doug Allan / Killer Whales (Orcinus orca) spy-hopping to observe Weddell Seal (Leptonychotes weddellii) in preparation to knock it from the ice by creating a wave. Marguerite Bay, Antarctic Peninsula, summer. Free...

Doug Allan / Killer Whales (Orcinus orca) create bow wave to knock Weddell Seal (Leptonychotes weddellii) from the ice; a co-operative hunting strategy. Marguerite Bay, Antarctic Peninsula, summer. Freeze Frame bo...

Doug Allan / Killer Whales (Orcinus orca) approaching Weddell Seal (Leptonychotes weddellii) in preparation to knock it from the ice by creating a wave. Marguerite Bay, Antarctic Peninsula, summer. Freeze Frame bo...

Juan Carlos Munoz / South African fur seal (Arctocephalus pusillus pusillus) swimming near surface, Seal Island. False Bay, South Africa, July 2010

Michael Pitts / Bull Elephant seal (Mirounga sp) portrait with penguin walking along beach, St Andrews Bay, South Georgia

Michael Pitts / Southern giant petrel (Macronectes giganteus) head covered in blood feeding on carcass of an Elephant seal pup, with a penguin colony in the distance, St Andrews Bay, South Georgia

Graham Eaton / Young Grey Seal (Halichoerus grypus) underwater amongst kelp, Cardigan Bay, Wales, UK, July

Graham Eaton / Young Grey Seal (Halichoerus grypus) in murky water, Cardigan Bay, Wales, UK, July

Yva Momatiuk & John Eastcott / Southern Elephant Seal (Mirounga leonina) pups, fat and docile weaners stay together for company and reassurance, St. Andrews Bay, South Georgia Island

Peter Bassett / Aggressive bull elephant seal and penguins on beach at St Andrews Bay, South Georgia

Franco Banfi / Spotted seal (Phoca largha) head above water, boulders in foreground. Vrangel Bay, Primorsky Krai, Russia. August.

Nick Garbutt / King penguin (Aptenodytes patagonicus) group following each other in line, returning to sea, Southern elephant seal (Mirounga leonina) colony in background. St Andrews Bay, South Georgia. November 201...

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 / Weddell seal (Leptonychotes weddellii) female hauled out with pup, Atka Bay, Queen Maud Land, Antarctica. October.

Stefan Christmann / Weddell seal (Leptonychotes weddellii) female hauled out with pup, Atka Bay, Queen Maud Land, Antarctica. October.

Stefan Christmann / Weddell seal (Leptonychotes weddellii) yawning female hauled out with pup, Atka Bay, Queen Maud Land, Antarctica. October.

Stefan Christmann / Weddell seal (Leptonychotes weddellii) pup suckling, Atka Bay, Queen Maud Land, Antarctica. October.

Stefan Christmann / Weddell seal (Leptonychotes weddellii) resting hauled out, Atka Bay, Queen Maud Land, Antarctica. October.

Stefan Christmann / Weddell seal (Leptonychotes weddellii) female sleeping hauled out with pup, Atka Bay, Queen Maud Land, Antarctica. October.

Stefan Christmann / Weddell seal (Leptonychotes weddellii) pup lying on back and grooming flipper, Atka Bay, Queen Maud Land, Antarctica. October.

Franco Banfi / California sealion (Zalophus californianus) and Striped marlin (Tetrapturus audax) feeding on Sardine (Sardinops sagax) bait ball. Magdalena Bay, Baja California, Mexico.

Franco Banfi / California sea lion ( Zalophus californianus), rests on buoy, Magdalena Bay, Baja California Sur, Mexico.

Alex Hyde / Southern Elephant Seal pup (Mirounga leonina) suckling from mother in snow storm. King Haakon Bay, South Georgia. November.

Alex Hyde / Southern Elephant Seal females (Mirounga leonina). King Haakon Bay, South Georgia. November.

Alex Hyde / Southern Elephant Seal bull (Mirounga leonina). This dominant bull or 'Beachmaster' fights off rival males to keep his harem of females. King Haakon Bay, South Georgia. November.

Alex Hyde / Front flipper of Southern Elephant Seal bull (Mirounga leonina) showing the five nails and webbing between each digit. King Haakon Bay, South Georgia. November.

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

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

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

Alex Hyde / Southern Elephant Seal bull (Mirounga leonina) challenging a rival male. King Haakon Bay, South Georgia. November.

Alex Hyde / Southern Elephant Seal bull (Mirounga leonina). This dominant bull or 'Beachmaster' fights off rival males to keep his harem of females. King Haakon Bay, South Georgia. November.

Alex Hyde / Southern Elephant Seal (Mirounga leonina) colony. King Haakon Bay, South Georgia. November.

Alex Hyde / Southern Elephant Seal (Mirounga leonina) colony. St. Andrews 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.

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 / Weddell seal (Leptonychotes weddellii) yawning, lying on ice. Atka Bay, Antarctica. April. Commended in the Mammals Category of the GDT Nature Photographer of the Year 2019

Stefan Christmann / Weddell seal (Leptonychotes weddellii) sleeping. Atka Bay, Antarctica. April.

Stefan Christmann / Leopard seal (Hydrurga leptonyx) yawning, lying on ice. Atka Bay, Antarctica. February.

Steven David Miller / Australian sea lion (Neophoca cinerea) female crawling through bed of seaweed on beach. Seal Bay Conservation Park, Kangaroo Island, South Australia.

Steven David Miller / Australian sea lion (Neophoca cinerea) male basking whilst sitting in bed of seaweed. Seal Bay Conservation Park, Kangaroo Island, South Australia.

Steven David Miller / Australian sea lion (Neophoca cinerea) male basking on seaweed on beach. Seal Bay Conservation Park, Kangaroo Island, South Australia.

Steven David Miller / Australian sea lion (Neophoca cinerea) male basking on beach with Great crested terns (Thalasseus bergii) in foreground. Seal Bay Conservation Park, Kangaroo Island, South Australia.

Steven David Miller / Australian sea lion (Neophoca cinerea), two females interacting on beach having emerged from sea. Seal Bay Conservation Park, Kangaroo Island, South Australia.

Steven David Miller / Australian sea lion (Neophoca cinerea), two females greeting each other on beach. Seal Bay Conservation Park, Kangaroo Island, South Australia.

David Tipling / Young Antarctic fur seal (Arctocephalus gazella) St Andrews Bay South Georgia January

Ashley Cooper / Crabeater Seal (Lobodon carcinophaga) on an iceberg in Paradise Bay, Antarctica.

Tony Heald / Southern elephant seal (Mirounga leonina), male bloodied after a fight. Right Whale Bay, South Georgia. September.

Tony Heald / Southern elephant seal (Mirounga leonina), male at sunrise with King penguin (Aptenodytes patagonicus) colony in background. St Andrews Bay, South Georgia. October 2017.

Tony Heald / Southern giant petrel (Macronectes giganteus) fighting with Northern giant Petrel (Macronectes halli). Southern elephant seal (Mirounga leonina) male observing in background. St Andrews Bay, South Ge...

Tony Heald / Southern giant petrel (Macronectes giganteus) and Northern giant Petrel (Macronectes halli) fighting with beaks raised upwards. Southern elephant seal (Mirounga leonina) male observing in background....

Tony Heald / Southern elephant seal (Mirounga leonina), male tossing sand with mountains in background. St Andrews Bay, South Georgia. October 2017.

Tony Heald / Southern elephant seal (Mirounga leonina), male rearing up aggressively with King penguins (Aptenodytes patagonicus) in background. St Andrews Bay, South Georgia. October.

Tony Heald / Southern elephant seal (Mirounga leonina), two males fighting. St Andrews Bay, South Georgia. October.

Tony Heald / Southern elephant seal (Mirounga leonina), male exhaling in water. St Andrews Bay, South Georgia. October.

Tony Heald / Southern elephant seal (Mirounga leonina), male flicking sand over body on beach. Right Whale Bay, South Georgia. September.

Tony Heald / Southern elephant seal (Mirounga leonina), male blasted by sand in high winds. Right Whale Bay, South Georgia. September.

Tony Heald / Leopard seal (Hydrurga leptonyx) and Southern elephant seal (Mirounga leonina) male, threatening each other. St Andrews Bay, South Georgia. October.

Tony Heald / Leopard seal (Hydrurga leptonyx) and Southern elephant seal (Mirounga leonina) male, threatening each other. St Andrews Bay, South Georgia. October.