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The purple frog (Nasikabatrachus sahyadrensis), also known as the 'doughnut frog', was only discovered in 2003 as it spends most of the year buried 4m underground. Compared to similar species, the purple frog, which lives in India's Western Ghats, has an unusually small head and a strange pointed snout. (© Sathyabhama Das Biju)

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.

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