Yellowstone euthanizes bison calf after visitor interference.

A newborn bison calf was euthanized by Yellowstone National Park rangers after a visitor touched the animal in an attempt to help it catch up with its herd. The calf had been separated from its mother while crossing the Lamar River and was rejected by the herd after being handled by the visitor. Park rangers repeatedly tried to reunite the calf with the herd, but the herd resisted. The calf's persistence in approaching cars posed a hazard to guests, according to the National Park Service. Yellowstone requires visitors to stay at least 25 yards away from its two breeding bison herds.