A bison calf at Yellowstone National Park had to be euthanized after a man apparently tried to help it, causing the herd to reject it, park officials said this week.The newborn calf began following cars and people, officials said, and was killed because it posed a hazard to visitors.The episode began on Saturday evening, when the calf was separated from its mother as their herd crossed the Lamar River in Wyoming, in the park's northeast corner.
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