Yellowstone is studying its most troublesome species — humans

A string of incidents involving tourists leads the park to study us.

This year alone, officials at Yellowstone National Park have dealt with several issues regarding tourists:

The people who put a baby bison in their SUV because they they thought it was abandoned and cold and would die without their help or the 23-year-old tourist who died after falling into one of the park's famed hot springs when he was more than 250 yards off the designated path.

And don't forget the other lower-profile cases in which tourists got too close to wildlife, trampled through delicate wilderness areas or otherwise behaved badly and ignored the park's safety messaging.

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