Er..uhh..
Animals are NOT disney characters.
The animals don't secretly talk to each other when people aren't around, regardless of what disney movies may be.
In much of the USA, deer are overpopulated. It causes hazards for motorists, and suffering for the deer(not enough food, etc) Where I used to live(Amherst, NY near buffalo) the deer had to be constantly kept in check by hunters, just to keep them from starving. The lack of any predators requires humans to be the predators, or let the deer starve. Anyways, which is a more humane way for a deer to go? Starve, get your throat ripped out by a wolf, or shot by a hunter? The natural world is far more cruel than anything humans can do.
Anyways, A few years ago we were on the interstate, late at night, at the last 45mins of a four hour drive. Out of nowhere a deer leapt across the road, right in front of our minivan, and was decapitated from the impact.