Yellowstone warnings

Yellowstone National Park has always been a scary place.

Grizzly bears, boiling hot springs, and raging rivers have taken their toll over the years, but this spring its bison and elk that are sending folks to the hospital. In two separate incidents recently, cow elk roughed up a couple of women at Mammoth, and a bison gored a woman at the Lower Geyser Basin. Another woman was injured in early May when she was butted by a bison.

It’s nothing new. Run-ins with bison have become so common that visitors are given a crude illustration of a bison tossing a tourist into the air as a warning when they...