Humans eradicated timberwolves in the northeast, western coyotes bred with timberwolves and were able to acclimate here, they have since bred with dogs as well. They are a much larger animal than a western coyote. They didn’t appear in Vermont until the 1940’s and didn’t really get a large population until the 1960’s. By definition though, they are a non native species to the east and are thereby invasive.