Here in Maine the theory is that they came from Canada, and cross-bred with wolves during that migration. That's why Eastern Coyotes are bigger than those you find out west. I've seen a couple that could have, in terms of size, passed for German Shepherds here in Maine. The ones that I've seen out west were smaller.
Personally I think that they filled a gap that was created by the elimination of apex predators on the East Coast. I think that they spread in areas south of Maine by moving south, and by moving east. And I suspect that in twenty years we'll be able to track the very same behavior in cougars, without the wolf cross-breeding. I really don't want to be an old man facing a Crowlf in the back yard.
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