Report names the world's 100 most endangered species

Photos: The world's most endangered species

Hanging on: Pygmy three-toed sloth – There are less than 500 individual pygmy three-toed sloths left in the wild and are only found in on the Isla Escude de Veraguas, Panama.

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Photos: The world's most endangered species

Hainan gibbon – Found on Hainan island, China, conservationists believe less than 20 mature Hainan gibbons are still alive. Hunting has been the main reason for their perilous status as critically endangered.

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Photos: The world's most endangered species

Luristan newt – The Luristan newt is only found in three fast-flowing streams in the southern Zagros mountains in Iran. Their illegal collection for the pet trade has led to less than 1,000 mature individuals being left in the wild.

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Photos: The world's most endangered species

Spoon-billed sandpiper – Trapping and reclamation of its winter grounds has left the spoon-billed sandpiper on the brink of extinction. The global population is thought to be less than 100 breeding pairs.

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Photos: The world's most endangered species

Willow blister – The limited availability of habitat in Pembrokshire, Wales has led to this fungi being one of the world's most endangered.

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Photos: The world's most endangered species

Archey's frog – It is unknown how many Archey frogs are left in their natural habitat of the Coromandel peninsula and Whareorino Forest in New Zealand.

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Photos: The world's most endangered species

West Australian underground orchid – Around 95% of the West Australian underground orchid's natural habitat has been destroyed leading to estimates that less than 100 exist in the wild.

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