Why are Maine's animals bigger.

Some thing I can not seem to understand is animals in Maine.

Deer for example. Big bucks here weigh on avg 200 lbs.

We have less of a summer season alot less nutrition for deer to survive pregnant during the winter yet our deer are huge compared to deer in southern states.

Same with the coyote the western coyote is about 20 pounds. Full size adult. We have dogs larger than 50 lbs being shot nightly. 

Seems that this abnormally set of facts exist what should be smaller animals dealing with less food reverses itself in these cases.

Lets look at evolutionary biology Nature, the limiting factor in a Cold climate isn't food but the ability to maintain a body temp.A larger body is able to maintan a constant temp. easier then a smaller body frame.Look at the last Ice Age covering North America,the Mammals that were able to thrive were such that evolved to larger stature eg; Wooly Mammoth,Dire Wolf,Wooly Rhino,Running Bear,Welch Stag.All of these mammals were significantly larger then the species that survive today during a Politically Warming Climate Change.

Ok the wooly mammoth vs the mammoth in southern florida. The wooly mammoth was scawney compared to their southern cousin. 

Although possibly snow depth of powder conditions is an answer . Smaller animals.would.have a very hard time breaking trails...

I think of this this time of year as I walk deer paths in hopes.of finding knife handles from the fall horn sheds

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Trip6 brings up a good point. Also, many of the "wild" animals in central and southern regions are only semi-wild, living in very close proximity to urban environs. Maine is wide open and spacious. And sparsely populated. As far as Coyotes being smaller, I don't know. I saw one yesterday that looked like a freaking grey wolf!

It's the Poland Spring water. 

It's called Bergmann's Rule. Long hypothesis made short, it's very similar to post #2 relating to the ability to maintain a comfortable body temperature depending upon average annual climate. 

and i thought i was intelligent