Hiroya Minakuchi / Humpback Whale (Megaptera novaeangliae) pair gulp feeding and gulls hunting Northern Anchovy (Engraulis mordax), Monterey Bay, California

Igor Shpilenok,Igor Shpilenok / Kamchatka Brown Bear (Ursus arctos beringianus) on the Pacific coast of Kamchatka. Kronotsky Zapovednik Nature Reserve, Kamchatka Peninsula, Russian Far East, July.

Michael Pitts,Michael Pitts / Sooty Terns (Onychoprion fuscata) flock in flight, Midway Island. Central Pacific.

Ole Jorgen Liodden / Pacific Gull (Larus pacificus) Tasmania. December.

Suzi Eszterhas / Western Gull (Larus occidentalis) portrait, with nesting material in beak, Monterey Bay, California, USA, April

Michael Durham / Western Gull (Larus occidentalis) flock flying over the Oregon coast

Tony Wu / Greater crested tern (Thalasseus bergii) feeding on Sardine, Tonga.

Suzi Eszterhas / Forster's tern (Sterna forsteri) perched on post. Elkhorn Slough, Monterey Bay, California, USA. February.

Jeff Vanuga / Lava gull (Larus fuliginosus) near Dragons Hill, Santa Cruz Island, Galapagos Islands, Ecuador.

David Fleetham / Dusky Gull (Leucophaeus fuliginosus) in flight over Santa Cruz Island. With the population estimated at less than 800, this is one of the rarest gulls in the world. Galapagos Archipelago, Ecuador.

Ernie Janes / Pacific gulls (Larus pacificus) in flight over beach Tasmania, Australia.

Ernie Janes / Pacific gull (Larus pacificus) feeding on beach, Tasmania, Australia.

Ernie Janes / Pacific gull (Larus pacificus) feeding on beach, Tasmania, Australia.

Solvin Zankl / Fisherman haul up glowing nets of florescent Firefly Squid (Watasenia scintillans) with gulls scavenging, Namerikawa, Toyama Bay, Japan, May 2017.

Claudio Contreras / Heermann's gull (Larus heermanni) colony, San Benitos Islands, Baja California Pacific Islands Biosphere Reserve, Baja California, Mexico, May

Claudio Contreras / Heermann's gull (Larus heermanni) with chick, San Benitos Islands, Baja California Pacific Islands Biosphere Reserve, Baja California, Mexico, May

Franco Banfi / Greater crested terns (Thalasseus bergii) on a strip of sand with the MV Atlantis Azores liveaboard boat in distance, Tubbataha Reef Natural Park, UNESCO World Heritage Site, Sulu Sea, Cagayancillo...

Franco Banfi / Greater crested terns (Thalasseus bergii) on a strip of sand with the MV Atlantis Azores liveaboard boat in distance, Tubbataha Reef Natural Park, UNESCO World Heritage Site, Sulu Sea, Cagayancillo,...

Tony Wu / Eden's whale (Balaenoptera edeni edeni) named Mae Gunya and her calf Jao Khamsamut feeding on anchovies in the shallow waters of the upper Gulf of Thailand. Around them are whiskered terns (Chlidonias...

Tui De Roy / Swallow-tailed gulls (Creagrus furcatus) on coast, one in flight. Galapagos, Ecuador.

Tui De Roy / Brown noddies (Anous stolidus) in flight over water, Galapagos, Ecuador.

Hiroya Minakuchi / Humpback Whale (Megaptera novaeangliae) pair gulp feeding and gulls hunting Northern Anchovy (Engraulis mordax), Monterey Bay, California

Sylvain Cordier / White tern (Gygis alba), perched on a branch, Sand island, Midway Atoll National Wildlife Refuge, Hawaii

Sylvain Cordier / White tern (Gygis alba), in flight, Sand island, Midway Atoll National Wildlife Refuge, Hawaii

Claudio Contreras / Laughing gull (Larus atricilla), Roca Partida Island, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage Site (Socorro Islands), Pacific Ocean, W...

Claudio Contreras / Laughing Gull (Larus atricilla), Roca Partida Island, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage Site (Socorro Islands), Pacific Ocean, W...

Cyril Ruoso / Band-tailed gull (Larus belcheri) flying over sea with crab in beack, Nazca coastal desert, Peru

Suzi Eszterhas / Black-legged kittiwake (Rissa tridactyla) nest colony near waterfall, Prince William Sound, Alaska, USA.

Suzi Eszterhas / Black-legged kittiwake (Rissa tridactyla) nest colony near waterfall, Prince William Sound, Alaska, USA.

Franco Banfi / Pair of Swallow-tailed gulls (Creagrus furcatus) North Seymour Island, Galapagos Islands, East Pacific Ocean.

Gerrit Vyn / Slaty-backed gull (Larus schistisagus) calling. Chukotka, Russia. June.

Gerrit Vyn / Slaty-backed gull (Larus schistisagus) Chukotka, Russia. June.

Pascal Kobeh / Humpback whale (Megaptera novaeangliae) breaching the surface whilst feeding, surrounded by black-legged kittiwakes (Rissa tridactyla), Alaska, USA, Gulf of Alaska. Pacific ocean.

Brent Stephenson / Adult Grey ternlet (Procelsterna cerulea) in flight over the sea whilst feeding. Rangiroa, Tuamotu Islands, French Polynesia. September.

Jan Wegener / Pacific Gull (Larus pacificus), Australia

Jan Wegener / Pacific Gull (Larus pacificus), Melbourne, Australia

Tim Fitzharris / Gull (Larus sp) flock taking flight, Refugio State Beach, California

Mark Carwardine / Two Common / Mew gulls (Larus canus) on ice floe, Tracy Arm, South East Alaska, USA

Mark Carwardine / Herring gull (Larus argentatus) adult in breeding plumage standing on ice floe, Tracy Arm, South East Alaska, USA

Ole Jorgen Liodden / Pacific Gull (Larus pacificus) in flight. Tasmania. December.

Brent Stephenson / Southern black backed / kelp gull (Larus dominicanus) in flight low over the sea with a wave behind, off Kaikoura, Canterbury, New Zealand

Kirkendall-Spring / Western seagull (Larus occidentalis) among invasive Ice plant (Mesembryanthemum sp) with East Anacapa Island Lighthouse beyond, Channel Islands National Park, California, USA, April 2011.

Kevin Schafer / Glaucous-winged Gull (Larus glaucescens) eating a seastar, Puget Sound, Washington

Kevin Schafer / Glaucous-winged Gull (Larus glaucescens) eating a sea star, Puget Sound, Washington

Martin Willis / Pacific Gull (Larus pacificus) pair by the ocean, Cheyne Beach, Western Australia, Australia

Suzi Eszterhas / Western Gull (Larus occidentalis) perched on rock, Monterey Bay, California, USA, April

Suzi Eszterhas / Large flock of Bonapartes Gull (Chroicocephalus philadelphia) on water, Monterey Bay, California, USA, April

Pete Oxford / Orca (Orcinus orca) female followed by gulls picking up scraps of meat from Southern Elephant Seal (Mirounga leonina) kill, East Falkland Island, Falkland Islands

Jouan & Rius / Pacific gull (Larus pacificus) portrait of juvenile standing on rocks, Kalbarri National Park, Western Australia

Mark Carwardine / Humpback whale (Megaptera novaeangliae) lunging male fighting over a female, gull flying past, Sea of Cortez, Baja California, Mexico

Pete Oxford / Swallow-tailed gull (Larus / Creagrus furcatus) flying over Pacific ocean, Punto Cevallos, Española (Hood) Island, Galapagos islands, Equador, South America

Pete Oxford / Swallow-tailed gull (Larus / Creagrus furcatus) flying over Pacific ocean, Punto Cevallos, Española (Hood) Island, Galapagos islands, Equador, South America

Jouan & Rius / Pacific gull (Larus pacificus), Kangaroo Island, South Australia, Australia

Tim Laman / Swallow-tailed gull (Creagrus furcatus) flying. Champion Islet off Floreana (Charles) Island, Galapagos Islands.

Tim Laman / Swallow-tailed gull (Creagrus furcatus) roosting. Champion Islet off Floreana (Charles) Island, Galapagos Islands.

Jack Dykinga / Two swallow-tailed gulls (Creagrus fucatus) on their nest in a lava flow on Genovesa (Tower) Island, known as the "Island of Birds", Galapagos

Jack Dykinga / Two swallow-tailed gulls (Creagrus fucatus) at their nest in a lava flow on Genovesa (Tower) Island, known as the "Island of Birds", Galapagos

Pete Oxford / Pacific Green Sea Turtle (Chelonia mydas agassizi) hatchling being taken by a Lava Gull (Larus fuliginosus), Tortuga Bay, Santa Cruz Island, Galapagos Islands, Ecuador

Dave Watts / Pacific Gull (Larus pacificus) stetching it's wings, Tasmania, Australia

Michael Durham / Western Gull (Larus occidentalis) flock flying over the Oregon coast

Mitsuaki Iwago / Silver Gull (Larus novaehollandiae) feeding on a baby Green Sea Turtle (Chelonia mydas) at sunset, Australia

Dave Watts / Pacific gull in flight {Larus pacificus} Australia

Richard Herrmann / Brown Pelican (Pelecanus occidentalis) and gulls hunting Northern Anchovy (Engraulis mordax), Monterey Bay, California

Gary Bell/ Oceanwide / Pacific Gull (Larus pacificus) stretching, South Australia, Australia

Jaymi Heimbuch / Western Gull (Larus occidentalis), Yaquina Head Outstanding Natural Area, Newport, Oregon

Jaymi Heimbuch / Western Gull (Larus occidentalis) feeding on Purple Sea Urchin (Strongylocentrotus purpuratus) prey, Yaquina Head Outstanding Natural Area, Newport, Oregon

Rob Drummond/ BIA / Pacific Gull (Larus pacificus) juvenile feeding on fish prey, Victoria, Australia, sequence 4 of 4

Rob Drummond/ BIA / Pacific Gull (Larus pacificus) juvenile feeding on fish prey, Victoria, Australia, sequence 3 of 4

Rob Drummond/ BIA / Pacific Gull (Larus pacificus) juvenile feeding on fish prey, Victoria, Australia, sequence 2 of 4

Rob Drummond/ BIA / Pacific Gull (Larus pacificus) juvenile feeding on fish prey, Victoria, Australia, sequence 1 of 4

Jan Wegener/ BIA / Pacific Gull (Larus pacificus) pair, Melbourne, Australia

Hiroya Minakuchi / Humpback Whale (Megaptera novaeangliae) pair gulp feeding and gulls hunting Northern Anchovy (Engraulis mordax), Monterey Bay, California

Hiroya Minakuchi / California Sea Lion (Zalophus californianus) group and gulls hunting on Northern Anchovy (Engraulis mordax), Monterey Bay, California

Hiroya Minakuchi / Humpback Whale (Megaptera novaeangliae) gulp feeding and gulls hunting Northern Anchovy (Engraulis mordax), Monterey Bay, California

Kevin Schafer / Glaucous-winged Gull (Larus glaucescens) eating a seastar, Puget Sound, Washington

Nick Garbutt / Pod of Humpback whales (Megaptera novaeangliae) lunge / bubble-net feeding with flock of Glaucous-winged gulls (Larus glaucescens) in flight above, Sitka Sound, south east Alaska, USA. Pacific Ocean.

Marie Read / Group of Red-legged kittiwakes (Rissa brevirostris) perched on a rock along the shore, two calling as another flies overhead, with a Black-legged kittiwake (Rissa tridactyla) perched behind, St. Paul,...

Marie Read / Group of Red-legged kittiwakes (Rissa brevirostris) adults in breeding plumage, perched on a rock in water, two calling aggressively as an immature Kittiwake lands between them, St. Paul, Pribilof Isl...

Doug Gimesy / Pacific gull (Larus pacificus) on water, Sandringham, Victoria, Australia.

Doug Gimesy / Pacific gull (Larus pacificus) portrait, Port Philip Bay, Sandringham, Victoria, Australia.

Doug Gimesy / Pacific gull (Larus pacificus) walking through shallow water, foraging in intertidal rocks, Port Philip Bay, Sandringham, Victoria, Australia.

Doug Gimesy / Pacific gull (Larus pacificus) feeding on a mussel on intertidal rocks, Port Philip Bay, Sandringham, Victoria, Australia.

Harry Collins / Brown bear (Ursus arctos) feeding on a Sockeye salmon (Oncorhynchus nerka) in a shallow river. Glacous-winged gulls (Larus glaucescens) fly into frame and congregate around the bear. Katmai, Alaska, A...

Nick Garbutt / Humpback whales (Megaptera novaeangliae) lunge feeding with flocks of Glaucous-winged gulls (Larus glaucescens) above, Sitka Sound, south east Alaska, USA. March

Roland Seitre / Common noddy (Anous stolidus) flock in flight over lagoon, Rangiroa, Tuamotus, French Polynesia.

Roland Seitre / Inca tern (Larosterna inca) flock in flight over the ocean, Guanera Punta San Juan, Ica, Peru.

Roland Seitre / Inca tern (Larosterna inca) flock in flight over the ocean, Guanera Punta San Juan, Ica, Peru.

Roland Seitre / Inca tern (Larosterna inca) in flight over the ocean, Guanape Islands, Peru, Pacific Ocean.

Roland Seitre / Inca tern (Larosterna inca) flock perched on coastal rocks, Guanera Punta San Juan, Ica, Peru.

Roland Seitre / Inca tern (Larosterna inca) flock in flight over coastal cliffs, Guanera Punta San Juan, Ica, Peru, Pacific Ocean.

Roland Seitre / Inca tern (Larosterna inca) in flight over the ocean, Guanape Islands, Peru, Pacific Ocean.

Roland Seitre / Inca terns (Larosterna inca) landing on cliffside, Guanape Islands, Peru, Pacific Ocean.

Tom Vierus / Aerial tracking shot of Greater crested tern (Thalasseus bergii) flock flying by 'Bird Island', a small sandbank between Yanuca Island and Viti Levu, Fiji, Pacific Ocean.

Tui De Roy / Royal Tern (Thalasseus maximus) preying on newly hatched Olive ridley turtle (Lepidochelys olivacea), holding one in beak. Playa Escobilla Sanctuary, Oaxaca, Mexico. Pacific Ocean.

Tui De Roy / Royal Tern (Thalasseus maximus) preying on newly hatched Olive ridley turtle (Lepidochelys olivacea), holding one in beak. Playa Escobilla Sanctuary, Oaxaca, Mexico. Pacific Ocean.

Tui De Roy / Royal Tern (Thalasseus maximus) preying on newly hatched Olive ridley turtle (Lepidochelys olivacea), holding one in beak. Playa Escobilla Sanctuary, Oaxaca, Mexico. Pacific Ocean.