LIVE in Sumatra
BBC Earth joins three critically endangered animals. But there's still reason for hope.
Project Hope
Project Hope spotlights some of our planet's most extraordinary natural wonders that are disappearing before our eyes. Yet in the darkness there is still hope.
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Sumatra's wildlife champions
Meet Dr Peter Pratje - otherwise known as the 'orangutan grandfather'
Meet the animals
Get to know more about the animals featured in Project Hope.