Stewart Island, New Zealand's third largest and southernmost island, is a place of dramatic beauty and unpredictability. Here, the Pot-bellied Seahorse father has extra responsibilities, the Octopus is both hunter and hunted, and 82 Great White Sharks need to eat, too. Standing at just 30cm and weighting only 1 kg, the Little Blue Penguin is nonetheless a swift swimmer and a determined parent.

The Kermadec Islands are in New Zealand's northern-most waters, and during a spring plankton bloom triggers a carnival of life, from tiny coral polyps to the largest humpback whales.

Around White Island, common dolphins, Australasian gannets and local reef residents adapt to survive the toxin conditions on New Zealand's most active volcano.