Wim van den Heever / Bottlenose Dolphin (Tursiops truncates) mother and calf porpoising during annual Sardine run, Port St Johns, South Africa, June.

David Pattyn / Children snorkelling in the sea and swimming with bottlenose dolphins (Tursiops truncatus) with boat approaching. Indian Ocean, Zanzibar, Tanzania, August 2014.

Pedro Narra / Bottlenose dolphin (Tursiops truncatus) baby age two weeks porpoising, Sado Estuary, Portugal

Wim van den Heever / Bottlenosed dolphins (Tursiops truncatus) porpoising during annual sardine run, Port St Johns, South Africa, June.

Wim van den Heever / Bottlenosed dolphin (Tursiops truncatus) porpoising during annual sardine run, Port St Johns, South Africa. June.

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...

Jack Dykinga / Bottlenose dolphins (Tursiops truncatus) near Isla Animas, Sea of Cortez, Baja Sur, Mexico.

Suzi Eszterhas / Bottlenose Dolphin (Tursiops truncatus) jumping, Baja California, Mexico

Pedro Narra / Bottlenose Dolphin (Tursiops truncatus) family swimming near the surface, Sado Estuary, Portugal

Graham Eaton,Graham Eaton / Bottlenose Dolphin (Tursiops truncatus) splashing water as it surfaces, Cardigan Bay, Wales, May

Denis-Huot / Bottlenose dolphin (Tursiops truncatus) playing in the waves of an oil tanker, Port Aransas, Texas, USA

Denis-Huot / Bottlenose dolphin (Tursiops truncatus) playing in the waves of an oil tanker, Port Aransas, Texas, USA