Richard Robinson / Maui's dolphin (Cephalorhynchus hectori maui) Critically Endangered, the world's smallest and rarest marine dolphin. Endemic to North Island, New Zealand. October. Editorial use only.

Richard Robinson / William Trubridge diving - a world champion free diver who is campaigning to protect the Critically Endangered Maui's dolphin (Cephalorhynchus hectori maui) endemic to New Zealand. January 2008. Edi...

Richard Robinson / Hector's dolphins (Cephalorhynchus hectori) Akaroa Harbour, South Island, New Zealand, November. Editorial use only.

Richard Robinson / Hector's dolphin (Cephalorhynchus hectori) Akaroa Harbour, South Island, New Zealand, November. Editorial use only.

Richard Robinson / Maui's dolphins (Cephalorhynchus hectori maui) Critically Endangered, the world's smallest and rarest marine dolphin. Endemic to North Island, New Zealand, March. Editorial use only.

Juan Carlos Munoz / Piebald / Commerson's dolphin (Cephalorhynchus commersonii) entering the water after a jump. Deseado River, Puerto Deseado, Patagonia, Argentina, Nov 2008

Doug Perrine / Piebald / Commerson's dolphins {Cephalorhynchus commersonii} captive, digital composite Occurs southern South America

Todd Pusser / Heavisides dolphin at surface {Cephalorhynchus heavisidii}, Brittania Bay, South Africa

Todd Pusser / Hector's dolphins below surface {Cephalorhynchus hectori} Kaikoura, New Zealand Pacific

Ben Osborne / Piebald / Commersons dolphin surfing {Cephalorhynchus commersonii} Falkland Is

TOM WALMSLEY / Hectors dolphins surfacing {Cephalorhynchus hectori} Akaroa, New Zealand

TOM WALMSLEY / Hectors dolphins underwater {Cephalorhynchus hectori} Akaroa, New Zealand