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The world's southernmost forest, New Zealand's sub-Antarctic islands.

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The Sares Islands are about 200km south of New Zealand, close to the Antarctic.

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The world's southernmost forests are located here,

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fostered by the mild climate created by the warm current around the area.

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The trees are twisted and bent by the strong winds.

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The islands, with their harsh environment and surrounding steep cliffs,

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have become a habitat for many unfamiliar creatures.

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This is a New Zealand sea lion.

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It moves slowly through the forest.

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The bird walking with its large webbed feet is a buller's albatross.

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The birds mix bits of soil and plants together using their saliva

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and make their nest to hatch their eggs inside.

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Thousands of shearwaters fly overhead.

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Is this a failed landing?

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Their nest, in fact, is made under the ground.

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Their chicks are raised below the surface.

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These are snares-crested penguins.

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After catching their food, they have to climb steep cliffs to get back to the island.

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Then they walk up the hills, crossing obstacles along the way.

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The journey finally ends when they reach their breeding ground hidden deep inside the forest.

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It may be very far from the sea, but the flat area is a safe place to breed their chicks.

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It's believed that the penguins' ancestors were the seabirds which nested in the forest.

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Penguins are going down the cliff to catch their prey.

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It can be a risky exercise.

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Even for adult penguins.

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A chick here is attacked by a giant petrel.

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Cold and warm currents meet around the islands and produce large amounts of plankton.

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Many fish gather to eat the plankton, and then the birds gather to feed on it.

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The fish gather to eat the plankton, and then the birds gather to catch the fish.

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This southernmost forest is a marvellous display of the work of nature over a myriad of centuries.