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Scientist Joel Berger has dedicated ten years of his life to studying muskoxen. With global warming affecting their habitat, muskoxen have increasingly come into contact with roaming polar bears. Joel wanted to investigate the effect of this on muskoxen behaviour - and with no polar bear to call on - he improvised. He grabbed his polar bear costume and headed north. Joel is the author of the book Extreme Conservation. He started by answering the question - what exactly are muskoxen? (Photo courtesy of Joel Berger.)