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Officials are trying to identify who caused the death of a Hector's dolphin on the West Coast earlier this year.
A three-year study study has revealed there could be twice as many endangered Hector's dolphins in New Zealand waters as previously thought.
Two new studies estimate 20 times more dolphins might be killed by the fishing industry than is reported, and Greenpeace says the government is to blame.
After more than 30 years of studying the world's smallest dolphins Liz Slooten and Steve Dawson still enjoy getting out on the water to observe Hector's dolphins, writes Alison Ballance. Video, Audio, Gallery
Science historian Simon Nathan discusses his biography of Sir James Hector, New Zealand's first government scientist. Audio