Will your car hit that deer? Depends on your headlight bulbs—and the deer’s personality

“It’s a really exciting area of research,” says John Orrock, a behavioral ecologist at the University of Wisconsin–Madison who was not involved in the study. “What’s key here is that it’s not whether you’ve got a deer in the headlights—and not so much even which headlights—but which deer you have in the headlights.”