Tony Wu / Bowhead whale (Balaena mysticetus), group socialising in shallow water, aerial view. Part of larger group of more than 50 whales congregating, Sea of Okhotsk sub-population, Russia.

Nick Hawkins / North Atlantic right whale (Eubalaena glacialis) tail fluke, diving to feed in the Gulf of Saint Lawrence, Canada. Endangered species. July

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

Hiroya Minakuchi / Southern Right Whale (Eubalaena australis) sailing at sunset, Peninsula Valdez, Argentina

Agustin Esmoris / Southern Right Whale (Eubalaena australis) surfacing with Kelp Gull (Larus dominicanus) picking off lice, Chubut, Argentina, sequence 1 of 4

Gabriel Rojo / Southern Right whale (Eubalaena australis) breaching, Peninsula Valdes, Chubut, Patagonia, Argentina.

Chris & Monique Fallows / Southern right whale (Eubalaena australis) breaching, False Bay, Cape Town, South Africa.

Chris & Monique Fallows / Southern right whale (Eubalaena australis) spyhopping, False Bay, Cape Town, South Africa.

Chris & Monique Fallows / Southern right whale (Eubalaena australis) close up feeding on plankton at surface, False Bay, Cape Town, South Africa; with barnacles on head

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 / Silhouette of Southern right whale (Eubalaena australis) Golfo Nuevo, Peninsula Valdes, UNESCO Natural World Heritage Site, Chubut, Patagonia, Argentina, Atlantic Ocean, October

Franco Banfi / Southern right whale (Eubalaena australis) with patches covered in parasitic crustaceans named cyamids or whale lice (Cyamus ovalis). Golfo Nuevo, Peninsula Valdes, UNESCO Natural World Heritage Site,...