ive never had an opposum but ive had a bunch of possums
http://en.wikipedia.org/wiki/Possum, little bastards run straight up your leg and sit on top of your head when you tame em,which can become a bit of an issue when they get bigger, they are a pest here in New Zealand introduced here from Australia and the government spends millions every year poisoning them with big aerial drops,man they will do anything to get to your weed,cyanide being the only foolproof way to keep em away (although i wouldnt recommend fools play with cyanide lol) that thing is cute but not as cute as a possum, i shot a couple doz of em last weekend,the fur off em is worth $100 buks a kilo,takes 12-15 possums to get a kilo in winter.