What prompts a hunter to shoot an animal after it is spotted? Wageningen and Norwegian researchers studied more than 180,000 choice situations where hunters had spotted an animal and had to decide whether or not to shoot. They found that competition among hunters and the season coming to an end led to an increased likelihood of pulling the trigger. The research team published an article this week in the scientific journal PNAS in which they recommend that future wildlife management should take into account the social conditions surrounding hunting.