Chase Dekker / Humpback Whale (Megaptera novaeangliae) pod gulp feeding on Northern Anchovy (Engraulis mordax), Monterey Bay, California

Alex Mustard / Spinner dolphin (Stenella longirostris) pod socialising close to surface. Fury Shoal, Sataya Reef, Marsa Alam, Egypt.

Alex Mustard / Killer whales (Orcinus orca) at the surface in an Arctic fjord in Spildra, northern Norway, with sea birds. Arctic Ocean

Alex Mustard / Pod of False killer whales (Pseudorca crassidens) swimming beneath the surface of the ocean. Indian Ocean, off Sri Lanka.

Franco Banfi / Pod of sperm whale socializing, (Physeter macrocephalus), Dominica, Caribbean Sea, Atlantic Ocean.

Espen Bergersen / Killer whales / orcas (Orcinus orca). Spyhopping. Kvaloya, Troms, Norway October

Espen Bergersen / Killer whales / orcas (Orcinus orca). Spyhopping. Kvaloya, Troms, Norway October

SCOTLAND: The Big Picture / Orca whales (Orcinus orca) pod surfacing together, Shetland, Scotland, UK. April.

SCOTLAND: The Big Picture / Orca (Orcinus orca) surfacing and blowing, Shetland, Scotland, UK, August.

Espen Bergersen / Aerial shot of a pod of Killer whales (Orcinus orca) swimming near the surface, Troms, Norway, October.

Espen Bergersen / Aerial shot of a group of Killer whales (Orcinus orca) tail slapping, shot pans to the right, Skjervoy, Troms, Norway, November.

Espen Bergersen / Aerial shot of Killer whale (Orcinus orca) hunting Atlantic herring (Clupea harengus) using carousel feeding, with herring jumping out of the water and gulls (Larus) circling above, Tromvik, Troms, No...

Espen Bergersen / Aerial shot of a female Humpback whale (Megaptera novaeangliae) and calf surrounded by Killer whales (Orcinus orca), mother hits sideways with her tail fluke to drive Killer whales away, Skjervoy, Tro...

Espen Bergersen / Aerial shot of a small pod of Killer whales (Orcinus orca) at surface, with snowy landscape in the background, Skjervoy, Troms, Norway, December.

Espen Bergersen / Aerial shot of a pod of Killer whales (Orcinus orca) carousel feeding, Skjervoy, Troms, Norway, November.

Espen Bergersen / Aerial shot of a pod of Killer whales (Orcinus orca) carousel feeding, Skjervoy, Troms, Norway, November.

Espen Bergersen / Aerial shot of a pod of Killer whales (Orcinus orca) carousel feeding, drone moving closer, Skjervoy, Troms, Norway, November.

Paul Souders/ Worldfoto / Humpback Whale (Megaptera novaeangliae) pod cooperative bubble-net feeding, Frederick Sound, Alaska

Paul Souders/ Worldfoto / Humpback Whale (Megaptera novaeangliae) pod cooperative bubble-net feeding, Frederick Sound, Alaska

Chase Dekker / Long-beaked Common Dolphin (Delphinus capensis) pod porpoising, Monterey Bay, California

Chase Dekker / Humpback Whale (Megaptera novaeangliae) pod gulp feeding, Monterey Bay, California

Stephane Granzotto / Tracking shot of a pod of Euphrosyne dolphins (Stenella coeruleoalba) swimming, Mediterranean Sea, August.

Hiroya Minakuchi / Humpback Whale (Megaptera novaeangliae) trio gulp feeding, Inside Passage, southeast Alaska

Richard Robinson / Long-finned pilot whales (Globicephala melas) offshore, Northern New Zealand. Editorial use only.

Hiroya Minakuchi / Humpback Whale (Megaptera novaeangliae) pod gulp feeding, Inside Passage, southeast Alaska

Hiroya Minakuchi / Humpback Whale (Megaptera novaeangliae) pod gulp feeding, Inside Passage, southeast Alaska

Richard Robinson / False killer whales (Pseudorca crassidens) traveling with a pod of pelagic Bottlenose dolphins (Tursiops truncatus) Northern New Zealand

Richard Robinson / False killer whales (Pseudorca crassidens) travelling with a pod of pelagic Bottlenose dolphins (Tursiops truncatus) Northern New Zealand Editorial use only.

Franco Banfi / Sperm whale (Physeter macrocephalus) pod, Dominica, Caribbean Sea, Atlantic Ocean, January, Vulnerable species.

Franco Banfi / Sperm whales (Physeter macrocephalus) socialising with free diver stopped between two individuals, Dominica, Caribbean Sea, Atlantic Ocean, January, Vulnerable species. Model released.

Terry Whittaker / Pod of Killer whales (Orcinus orca) at surface, Grundarfjordur, Iceland, March.

Terry Whittaker / Water vole (Arvicola amphibius) feeding on Yellow flag iris (Iris pseudacorus) seed pods, Kent, England, UK. October.

SCOTLAND: The Big Picture / Pod of Bottlenose dolphins (Tursiops truncatus) surfacing just offshore, Black Isle, Scotland, UK, July.

Ingo Arndt / Slug moth caterpillar mimics seed pod {Perola sp} Guanacaste, Costa Rica, Central America

Espen Bergersen / Humpback whales (Megaptera novaeangliae) bubble net / lunge feeding on herring (Clupea harengus) at dusk, pod co-operative feeding, Kvaloya, Troms, Norway, November

Tony Wu / Killer whale / Orca (Orcinus orca) mature male in the foreground, with other mature males visible behind, Norway, January

Tony Wu / Humpback whales (Megaptera novaeangliae) bubble net feeding with mouths open at surface, example of cooperative hunting, Chatham Strait, Alaska, USA July

Doug Perrine / False killer whale (Pseudorca crassidens) pod, off the Kona Coast of Hawaii Island, Hawaiian Islands, USA. January.

Chris & Monique Fallows / Dusky dolphins (Lagenorhynchus obscurus) porpoising, Puerto Madryn, Peninsula Valdez, Argentina, December.

Chris & Monique Fallows / Dusky dolphins (Lagenorhynchus obscurus) porpoising, Puerto Madryn, Peninsula Valdez, Argentina, December.

Franco Banfi / Cory's shearwaters (Calonectris diomedea) diving among a mass of shoaling fish to feed, along with Atlantic spotted dolphins (Stenella frontalis), Formigas Islet dive site, Azores, Portugal, Atlantic...

Franco Banfi / Cory's shearwaters (Calonectris diomedea) diving among a mass of shoaling fish to feed, along with Atlantic spotted dolphins (Stenella frontalis), Formigas Islet dive site, Azores, Portugal, Atlantic...

Wim van den Heever / Large pod of Bottlenose dolphins (Tursiops truncatus) porpoising over waves during annual sardine run, Port St Johns, South Africa. Runner up in the Animals in their Environment Category of the Wildl...

Chris & Monique Fallows / Long-beaked common dolphin (Delphinus capensis) school porpoising, False Bay, South Africa

Hiroya Minakuchi / Orca (Orcinus orca) pod surfacing, Prince William Sound, Alaska

Hiroya Minakuchi / Orca (Orcinus orca) pod surfacing, Hokkaido, Japan

Hiroya Minakuchi / Orca (Orcinus orca) pod surfacing, Hokkaido, Japan

Pascal Kobeh / Group of Short-finned pilot whales (Globicephala macrorhynchus) swimming down into deep water, Costa Rica. Pacific ocean.

Pascal Kobeh / Group of Short-finned pilot whales (Globicephala macrorhynchus) in open water, maybe the whole family with the male, the female and the calves, Costa Rica. Pacific ocean.

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

Ammonite / Small pod of Atlantic white-sided dolphins (Lagenorhynchus acutus) breaching, Azores, Portugal, July.

Richard Herrmann / Pacific White-sided Dolphin (Lagenorhynchus obliquidens) pod, Nine Mile Bank, San Diego, California

Chris & Monique Fallows / Common dolphin (Dephinus delphis) pod feeding on sardines (Sardinops oecllata) East London, South Africa.

Chris & Monique Fallows / Common dolphin (Dephinus delphis) pod feeding on sardines (Sardinops oecllata) East London, South Africa.

Chris & Monique Fallows / Common dolphin (Dephinus delphis) 'mega pod', False Bay, Cape Town, South Africa.

Chris & Monique Fallows / Orca (Orcinus orca) pod hunting common dolphin (Delphinus delphis) False Bay, South Africa.

Kevin Schafer / Common Dolphin (Delphinus delphis) pod, Santa Barbara Channel, Channel Islands National Marine Sanctuary, California

Pete Oxford / Long-beaked Common Dolphin (Delphinus capensis) pod and diving Cape Gannets (Morus capensis) hunting Pacific Sardines (Sardinops sagax), Eastern Cape, South Africa

Ben Hall / Orcas (Orcinus orca) pod feeding on herring, wide shot showing surrounding landscape, Iceland, January 2013

Michael Pitts,Michael Pitts / Spinner dolphins (Stenella longirostris) small pod in within Midway atoll, Midway, Pacific.

Steven Kazlowski / Killer whale (Orcinus orca) large pod with one male approaching, in Kenai Fjords National Park, Chiswell Islands National Marine Sanctuary, South Central Alaska, USA

Roland Seitre / Pod of Common Dolphin (Delphinus delphis) under water surface. The Azores.

Todd Mintz / Narwhal (Monodon monoceros) pod at surface with one tusk visible, Arctic Bay, Baffin Island, Canada, June

Pedro Narra / Common dolphins ( Delphinus delphis) swimming below the surface, Atlantic Ocean, Portugal, October

Pedro Narra / A pod of Bottlenose dolphins (Tursiops truncatus) porpoising, silhouetted at sunset, Sado Estuary, Portugal, November

Pedro Narra / A pod of Bottlenose dolphins (Tursiops truncatus) swimming into the Sado river, Portugal, July

Doug Perrine / Hawaiian / Gray's / Long-Snouted Spinner Dolphins (Stenella longirostris longirostris) with mother and young calf. Keauhou, Kona, Hawaii, Central Pacific Ocean.

Georgette Douwma / Pod of Bottlenose Dolphins (Tursiops truncatus). Egypt, Red Sea.

John MacPherson / 2020VISION / Two Bottlenose dolphins (Tursiops truncatus) breaching, Moray Firth, Inverness-shire, Scotland, UK, August. Photographer quote: 'After several frustrating hours with too short a lens and dolphins too...

Juergen Freund / Pod of Indo-Pacific bottlenose dolphins (Tursiops aduncus) just below sea surface in flat calm waters. Raja Ampat, West Papua, Indonesia, February 2010

Alex Mustard / A pod of Atlantic spotted dolphins (Stenella frontalis) riding on the bow wave of a boat. Sandy Ridge, Little Bahama Bank. Bahamas

Alex Mustard / A pod of Bottlenose dolphins (Tursiops truncatus) swimming beneath a calm sea surface. Sandy Ridge, Little Bahama Bank. Bahamas.

Mark Carwardine / Pod of Short-finned pilot whales (Globicephala macrorhynchus) at surface, Sea of Cortez, Baja California, Mexico

Jeff Rotman / Sequence 2/3 Diver with anti-shark POD examininf Tiger shark (Galeocerdo cuvier) caught in anti-shark net off Durban Beach, Natal, South Africa. Model released.

Wild Wonders of Europe / Lundgre / Common dolphins (Delphinus delphis) surfacing, Fisheye lens. Pico, Azores, Portugal, June 2009

Jack Dykinga / Velet-pod mimosa (Mimosa dysocarpa) flowering amongst Blue oak trees (Quercus oblongifolia) Atascosa Mountains, Coronado National Forest, Arizona, USA

Jack Dykinga / Velet-pod mimosa (Mimosa dysocarpa) flowering amongst Blue oak trees (Quercus oblongifolia) Atascosa Mountains, Coronado National Forest, Arizona, USA

Jack Dykinga / Velvet-pod mimosa (Mimosa dysocarpa) flanked by Blue oaks (Quercus oblongifolia) in the grassy foothills of the Atascosa Mountains, Coronado National Forest, Arizona

Steven Kazlowski / Killer whales / orcas (Orcinus orca) pod traveling beside a boat in waters off the western Antarctic Peninsula, Southern Ocean

Hiroya Minakuchi / Pantropical Spotted Dolphin (Stenella attenuata) pod bow riding, Ogasawara Island, Japan

Flip Nicklin / Orca (Orcinus orca) adult and breaching calf, southeast Alaska

Martha Holmes / Pod of Killer whales {Orcinus orca} with snowy mountains behind, Tysfiord, Norway

Doug Allan / White / Beluga whale pod {Delphinapterus leucas} migrating through sea ice, Arctic Canada. Aerial

Doug Perrine / Pod of Pygmy killer whales {Feresa attenuata}, Pacific

Doug Perrine / Pod of Shortfin pilot whales {Globicephala macrorhynchus} North Atlantic.

Doug Perrine / Pod of Pygmy killer whales {Feresa attenuata}, Pacific

Michael Pitts / Short finned pilot whale pod {Globicephala macrorhynchus} Mediterranean

Martha Holmes / Killer whale pod, Tvsfiord, Norway, Europe.

Todd Pusser / Southern right whale dolphins porpoising {Lissodelphis peronii} Kaikoura, New Zealand

Todd Pusser / Pod of transient killer whales {Orcinus orca} porpoising, Monterey Bay, California, USA.

Todd Pusser / Dusky dolphin group bow-riding {Lagenorhynchus obscurus}, Kaikoura, New Zealand, Pacific

Michio Hoshino / Humpback Whale (Megaptera novaeangliae) group cooperatively feeding on Capelin, Alaska

Mitsuaki Iwago / Humpback Whale (Megaptera novaeangliae) group bubble net feeding, Alaska

Flip Nicklin / Bottlenose Dolphin (Tursiops truncatus) pod, Hawaii

Norbert Wu / Orca (Orcinus orca) pod surfacing in icebreaker channel, must find open pockets of water to breathe, McMurdo Sound, Antarctica