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Also known as the 'dwarf sloth', the pygmy sloth lives off the coast of Panama and is critically endangered. Their exact population is not known, but it is feared there could be as few as 300 left in the world. (Craig Turner/ZSL)

Six of the world's ugliest endangered animals

While the whole world is aware of the plight of photogenic pandas and lions, there are dozens of species which aren't quite as easy on the eye but equally at risk.
The Zoological Society of London have released details of animals with 'unique evolutionary history' as part of their EDGE of Existence campaign, highlighting the conversation efforts taking place to save these truly special creatures.