I personaly feel like that if your not out in the bush raceing and acting like a wild man, an ATV has little or no effect on deer or animals and I know this as I have encountered moose and deer while rideing on regular basis, and as long as I don' t stop they' ll stay there, but as soon as you stop then they" re gone. Last week I was out ATV' ing on a quad trail to relocate some stands and traveling at maybe 10 mph and then out comes out in front of me is an ole Blackie at about 15 steps, all I could do is stop as we saw each other at the same time, the bear ran off and the layers of fat just rolled off it as it ran . For the past several years I have encountered lots of wildlife while being on the quad, but then again I am the only one useing the trails too, and I also have millions of acres to play in too. Bobby