Some see it as the “Holy Grail”, others a survivor of the last Ice Age or simply one of the world’s most secretive creatures, the saola. Last sighted decades ago it hasn’t been seen since.
Conservationists in Vietnam have tried in vain to track down the rare, endangered and elusive saola. They can't protect it until they know where it lives. To help in the search, they have enlisted blood-sucking leeches.
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