When bears raid campsites, it might be because of a relationship that developed thousands of years ago between humans and carnivores. That's what an archaeologist at Northern Arizona University believes. Chrissina Burke is looking at ancient bison kill sites to prove that wild animals have been conditioned to see humans as food providers.
Burke says, "The research focuses is really focused on how do humans impact animals on the landscape. So, what I've been looking at in that context is how carnivores came in, saw, and said, 'Oh hey look! A smorgasbord. Free food!"