According to the Internet Center for Wildlife Damage Management, the North American possum is a small, gray marsupial that is typically smaller than 40 inches in length. Different species of possum have different characteristics.
Possums have sparse gray fur and a long tail that appears similar to a rat's tail. The possum has a long, pointed nose and round black eyes. While the fur of the North American possum is mostly gray, some members of the species have a combination of gray and white fur.
According to the Australian Museum, species of possums living in Australia have mostly gray fur with brown and orange areas on the tail and legs. The stomach of the Australian ringtail possum is white.
Possums are nocturnal, eat a wide range of foods and can be found in many locations around the world.