Doug Perrine / Bryde's whale {Balaenoptera brydei / edeni} with throat pleats expanded after feeding on baitball of Sardines {Sardinops sagax} off Baja California, Mexico, Eastern Pacific Ocean. Veolia Environnement...

DOC WHITE / Blue whale underwater close-up of head and mouth feeding with pouch inflated, Mexico

Franco Banfi / Tail of Blue whale diving (Balaenoptera musculus brevicauda) possibly the pygmy sub-species of blue whale, (Balaenoptera musculus). Mirissa, Sri Lanka, Indian Ocean. Photo taken under permit

Franco Banfi / Tail of Blue whale (Balaenoptera musculus brevicauda). This may be the pygmy sub-species of blue whale, Balaenoptera musculus. Mirissa, Sri Lanka, Indian Ocean

Sergio Hanquet / Pilot whale (Globicephala macorhynchus) close-up of submerged adult. Tenerife, Canary Islands.

Alex Mustard / RF - Blue whale (Balaenoptera musculus) diving vertically down into the ocean to feed. Indian Ocean, off Sri Lanka. (This image may be licensed either as rights managed or royalty free.)

Alex Mustard / Blue whale (Balaenoptera musculus) swimming beneath the surface of the ocean. Indian Ocean, off Sri Lanka.

Alex Mustard / Blue whale (Balaenoptera musculus) swims beneath the surface of the ocean. Indian Ocean, off Sri Lanka.

David Fleetham / Humpback whale (Megaptera novaeangliae), mother and calf swimming just below surface in front of the West Maui Mountains. South of Lahaina, West Maui, Hawaii.

Tony Wu / Blue whale (Balaenoptera musculus indica) in Indian Ocean, Mirissa, Matara, Sri Lanka.

Alex Mustard / Blue whale (Balaenoptera musculus) diving beneath the surface. Indian Ocean, Sri Lanka.

Franco Banfi / Bryde's whale (Balaenoptera edeni) Trincomalee, Eastern Province, Sri Lanka, Bay of Bengal, Indian Ocean

Franco Banfi / Bryde's whale (Balaenoptera edeni) tail, Trincomalee, Eastern Province, Sri Lanka, Bay of Bengal, Indian Ocean

Brandon Cole / Blue whale (Balaenoptera musculus) lifts tail flukes in preparation for a feeding dive, California, USA, Pacific Ocean, August

Doug Perrine / Bottlenose dolphin (Tursiops truncatus) swimming with a pair of Humpback whales (Megaptera novaeangliae) Kona, Hawaii, USA

Tony Wu / Humpback whales (Megaptera novaeangliae) engaged in courtship, with the male hovering above the female. Vava'u, Tonga, Pacific Ocean.

Tony Wu / Humpback whale (Megaptera novaeangliae), fluke of female with male calf playing below, Vava'u, Tonga, Pacific Ocean.

Doc White / Blue whale (Balaenoptera musculus) aerial view off the coast of California, USA. Pacific Ocean.

Doc White / Blue whale (Balaenoptera musculus) underwater, Coronado Islands, Baja California, Mexico, Eastern Pacific Ocean

Tony Wu / Pygmy blue whale (Balaenoptera musculus brevicauda) swimming in blue water, Sri Lanka, Indian Ocean.

Tony Wu / Pygmy blue whale (Balaenoptera musculus brevicauda) diving with pelagic fish (likely yellowfin tuna or similar open ocean predatory species) visible in the background, Sri Lanka, Indian Ocean.

Tony Wu / Blue whale (Balaenoptera musculus) swimming in s motion, Sri Lanka, Indian Ocean.

Tony Wu / Pygmy blue whale (Balaenoptera musculus brevicauda) close-up view of tail fluke, Sri Lanka, Indian Ocean.

Luis Quinta / Blue whale (Balaenoptera musculus) Pico Island, Azores, Portugal. May.

Claudio Contreras / Whale shark (Rhincodon typus) feeding view of tail, Isla Mujeres, Caribbean Sea, Mexico, August. Vulnerable species.

Jordi Chias / Bryde's whale (Balaenoptera edeni) and Common dolphins (Delphinus delphis) chasing small fish offshore. Santa Maria Island, Azores, Atlantic Ocean. Third Place in the Underwater Category of the Por El...

Doug Perrine / Humpback whale (Megaptera novaeangliae) lone female playing, blowing bubble stream, Kona, Hawaii, USA.

Juergen Freund / Whale shark (Rhincodon typus) split level view, Cenderawasih Bay, West Papua, Indonesia. Second Place in the Portfolio Award of the Terre Sauvage Nature Images Awards Competition 2015.

Alex Mustard / Large whip goby (Bryaninops amplus) with a parasitic copepod (with two trailing egg ribbons) perched on Red whip coral. Whale Rock. Fiabacet Islands, Misool, Raja Ampat, West Papua, Indonesia. Ceram S...

Franco Banfi / Pygmy blue whale (Balaenoptera musculus brevicauda) subspecies of blue whale, Mirissa, Sri Lanka, Indian Ocean. Endangered species.

Franco Banfi / Pygmy blue whale (Balaenoptera musculus brevicauda) subspecies of blue whale, diving downwards, Mirissa, Sri Lanka, Indian Ocean. Endangered species.

Franco Banfi / Pygmy blue whale (Balaenoptera musculus brevicauda) subspecies of blue whale, diving down, Mirissa, Sri Lanka, Indian Ocean. Endangered species.

Franco Banfi / Pygmy blue whale (Balaenoptera musculus brevicauda) subspecies of blue whale, Mirissa, Sri Lanka, Indian Ocean. Endangered species.

Franco Banfi / Pygmy blue whale (Balaenoptera musculus brevicauda) subspecies of blue whale, Mirissa, Sri Lanka, Indian Ocean. Endangered species.

Pascal Kobeh / Orcas / killer whales (Orcinus orca) swimming in open water, Three Kings Islands, New Zealand. Pacific Ocean.

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.

Pascal Kobeh / Short-finned pilot whale (Globicephala macrorhynchus) close to the surface, Costa Rica. Pacific ocean.

Pascal Kobeh / Female Humpback whale (Megaptera novaeangliae) with its calf in open water, Reunion Island. Indian Ocean.

Pascal Kobeh / Female humpback whale (Megaptera novaeangliae) with its very young calf at the surface, Rurutu island, Australs Archipelago, French Polynesia. Pacific Ocean.

Richard Du Toit / Aerial photograph of Southern Right Whale (Eubalaena australis) with white calf, near Cape Agulhas, South Africa, Southern Right Western Cape Province, Indian Ocean, August

Franco Banfi / Sperm Whale (Physeter macrocephalus) Pico Island, Azores, Portugal, Atlantic Ocean

Alex Mustard,Alex Mustard / Whaleshark (Rhincodon typus) swimming and filtering fish eggs from the water. A behaviour known as ram-feeding. Isla Mujeres, Quintana Roo, Yucatan Peninsular, Mexico. Caribbean Sea.