A pod of Pacific white-sided dolphins (Lagenorhynchus obliquidens) leaping and surfacing in Johnstone Strait, British Columbia, Canada, North America

Gathering of at least two resident pods of killer whales (Orcinus orca) encountered near sunset, Johnstone Strait, British Columbia, Canada

Gathering of at least two resident pods of killer whales (Orcinus orca) encountered near sunset, Johnstone Strait, British Columbia, Canada

An adult Pacific white-sided dolphin (Lagenorhynchus obliquidens) bow-riding in Johnstone Strait, British Columbia, Canada

An adult bull among a pod of about 20 killer whales (Orcinus orca) in Antarctic Sound near the Antarctic Peninsula, Polar Regions

A pod of Pacific white-sided dolphins (Lagenorhynchus obliquidens) bow-riding in Johnstone Strait, British Columbia, Canada

Adult Commerson's dolphin (Cephalorhynchus commersonii), bow-riding in the Falkland Islands, South America

Dolphin watchers being eye balled by two leaping bottlenose dolphin (Tursiops truncatus truncatus) at Chanonry Point. Moray Firth, Scotland

Atlantic spotted dolphins (Stenella frontalis) and snorkellers towing on a rope behind boat. Bimini, Bahamas.

Sperm whale. (Physeter macrocephalus). A group of sperm whales socialising. Caribbean.

Spinner dolphins Stenella longirostris, Big Island, Hawaii, USA

Spinner dolphins Stenella longirostris, Big Island, Hawaii, USA

Split image of Spinner dolphins Stenella longirostris, and cliff, Big Island, Hawaii, USA

Spinner dolphins Stenella longirostris, Big Island, Hawaii, USA

Spinner dolphins Stenella longirostris, Big Island, Hawaii, USA