Mark Carwardine / Grey whale (Eschrichtius robustus) at water surface with mouth open showing baleen plates, San Ignacio Lagoon, Baja California, Mexico

Tony Wu / Humpback whale (Megaptera novaeangliae) adult female at rest. The tubercles on the whale's head are clearly visible, as are the barnacles (Coronula diadema), whale lice (Cyamus boopis), and hairs on t...

David Fleetham / Humpback whale (Megaptera novaeangliae) Hawaii.

Juergen Freund / Humpback whale (Megaptera novaeangliae) surfacing during the winter/spring humpback whale migration, Hervey Bay, Queensland, Australia September 2016.

Juergen Freund / Humpback whale (Megaptera novaeangliae) breaching, Hervey Bay, Queensland, Australia September 2016.

Alex Mustard / Atlantic spotted dolphin (Stenella frontalis) mother and young swimming over a shallow, sandy seabed. The adults are spotted and the younsters are plain coloured. Great Bahama Bank, North Bimini, Baha...

Mark Carwardine / Humpback whale (Megaptera novaeangliae) breaching, Baja California, Mexico

Mark Carwardine / Long beaked common dolphin (Delphinus capensis) pod porpoising Baja California, Mexico.

Mark Carwardine / Short finned pilot whale (Globicephala macrorhynchus) about to surface, Baja California, Mexico, February

Mark Carwardine / Pod of Risso Dolphin (Grampus griseus) at surface, Baja California, Mexico.

Espen Bergersen / Aerial view of Humpback whales (Megaptera novaeangliae) investigating Herring (Clupea harengus) caught in fishing net, with gulls, Norway. December. Second place in the Man and Nature Category of th...

Tony Wu / Indian Ocean blue whale (Balaenoptera musculus indica) swimming into the blue, Sri Lanka.