Yellowstone euthanizes baby bison touched by visitor.

A man who picked up a bison calf in Yellowstone National Park caused it to be shunned by its herd, prompting park officials to kill the animal rather than allow it to be a hazard to visitors. Bison must be quarantined before being sent to conservation herds outside the park, and a bison calf abandoned and unable to care for itself is not a good candidate for quarantine. The calf became separated from its mother when the herd crossed the Lamar river in north-eastern Yellowstone on Saturday.