I once read that the same species of animals tend to be larger the further from the equator you get. I believe this is referred to as Bergmans Rule. I don't know if Nebraska and Pa. are that much different in distance from the equator. The rule has to do with more mass to withstand the colder weather.
Yeah, this is true, when you get way away from the equater those dang deer turn white and get all fluffy and grow big teeth and claws!
