North American possums may look like really big rats, but they do have the most teeth of any North American mammal. Forty-four, in case anyone was interested. There was a family of them living under our apartment building and my landlord caught several of the young ones in a Hav-a-Hart trap. I had to explain to the landlady that no, they weren't some strange species of weasel, just baby possums. They were released back under the house because they weren't the woodchucks that the landlord was trying to catch.