Opossums may look like rats, but they are not. They are actually related to the koala and kangaroo. They may not be cute and cuddly looking as a koala but they are a marsupial which mean they ( the females ) have a pouch for babies.The opossum is North America's only native marsupial.Opossums eat snails and mice in your garden and eat left over dog and cat food in your yard too. So you don't want to leave it out to attract them. They are nocturnal animals which means they hunt at night! Some people think opossums are dirty, but they actually spend many hours each night cleaning themselves. You've heard the term "playing opossum"..... the reason for this comes from the fact that when opossums are caught the opossums try to fake death. This is a survival tactic for them. Many times another animal will leave them alone thinking it is dead and not seen as a threat. Opossums can have up to 19 babies twice a year! About 2 weeks after mating babies are born. They are blind, naked, and poorly developed and about the size of a bean. They have clawed front feet and use them to pull themselves up into the pouch where there are only 13 nipples. Sadly, the rest will not survive. The remaining 13 will stay there for about 2 months until their eyes open and can emerge. When big enough to leave the pouch the young are often carried on their mothers back. They hold on by thier fingers and their own tails. With so many babies being born so often, opossums are not endanged.