What If ?

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i dont think they would, that would be kind of a de-evolution thing dont ya think? I think the majority of animals would get bigger than normal as they would have less artificial predators and would not be so crowded for space. I think after oh say a couple hundred years when the citites and everything left behind by humans was fully deteriorated and there would be large plains and stuff where cities were that would soon turn back into forest areas. Lakes and rivers would get cleaned up. All or most of North America would end up being like Canada, if anyones been there you would get what im saying. As far as drastic evolution, I dont see it happening in North America, possibly the rain forest, africa or south america