The Opossum Family
More than 60 different kinds of oppossums live in South America and 1 in North America, the Virginia opossum didelphis virginiana. The name opossum is sometimes shortened to possum, which actually is the name for an Australian group of marsupials. These are distinct from opossums which are only found in North and South America. The Virginia opossum is probably best know for its last resort to escaping predators, "playing possum". As a last resort it can fake death to lose interest of its predator. The Virginia opossum is the only marsupial living in the wild in the US. They come in different shapes and sizes. They are marsupials meaning that they have a pouch in which they can carry their young. They all belong to the family didelphidae.
Some are living in trees and one, the water opossum or yapok, Chironectes minimus, is aquatic and his hind feet are webbed. The yapok is a long-legged opossum with a relatively broad snout, and a long, almost hairless, scaly tail except at its base. The water opossum is one of very few species able to forage in the trees and underwater. They can be found near streams or rivers in forested areas. Through evolution this marsupial has reversed the opening of its pouch so that the water doesn't force its way in when it is swimming under water. It is the only marsupial known to hunt in the water.
They can weigh as little as 40 grams, mouse opossum, to up to 2 kilograms, didelphis virginiana. Some are very rare, but it is unclear whether that has to do with opossums being nocturnal or that they are becoming extinct.
They have four claw-bearing toes and an opposable "big thumb", which they can move just like a thumb of humans, grabbing something and then move it back to walk or run. They use their prehensile tail for grasping.
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