Shane Gross / Bottlenose dolphin (Tursiops truncatus) underwater playing in the shallows off Eleuthera, Bahamas.

Shane Gross / Bottlenose dolphin (Tursiops truncatus) underwater rubbing herself on a sponge off Eleuthera, Bahamas.

Pedro Narra / Bottlenose dolphin (Tursiops truncatus) porpoising, Sado Estuary, Portugal. October

Pedro Narra / Bottlenose dolphin (Tursiops truncatus) porpoising, Sado Estuary, Portugal. July

Chris Gomersall / Bottlenose dolphin (Tursiops truncatus) breaching. Moray Firth, Scotland.

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.

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

SCOTLAND: The Big Picture / Bottlenose dolphin (Tursiops truncatus) breaching, Moray Firth, Scotland, UK, July.

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

Wim van den Heever / Bottlenose dolphin (Tursiops truncatus) porpoising at surface, Port St Johns, South Africa

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