Did Food Waste Make Bears Kill Humans?

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In 1972, Arthur Walker was killed by a grizzly bear in Yellowstone National Park in the USA. His death was subsequently blamed on a failed wildlife management scheme. Jordan Fisher Smith who spent 21 years as a park ranger explains how the sudden removal of food waste dumps from national parks forced bears to come into conflict with humans. (Image: A black bear at a garbage dump. Credit: Getty Images)