I’ve wondered about this too……This is just a theory of mine but what I think might happen is that the presence of abundant predators….whether it be human or coyotes…. may cause the deer to move less. The more a deer moves around in the open, the more it exposes itself to danger. Staying hid and still is where it feels the safest. I have no idea if this is actually happening or not but seems to me like it’s a possibility. The presence of “wolf” type predator would have to have some kind of an effect on them similar to how the heavy presence of a human one does.