Facts About the Common Opossum
A common opossum.
Credit: Heiko Kiera, Shutterstock

There are more than 60 species of opossum. The species that many people think of when hearing about this animal is the common opossum, also known as Virginia opossum. However, these are two different species. The common opossum's scientific name is Didelphis marsupialis, and the Virginia opossum's scientific name is Didelphis virginiana.

These types of opossums have a cone-shaped nose with a pink tip, a long hairless tail, and white, gray and black fur. Opossums are the only marsupial found naturally in North America. 

Opossums are about the size of small dogs. They are about 2.5 feet (76 centimeters), nose to tail, and weigh 8.8 to 13.2 lbs. (4 to 6 kilograms), according to National Geographic.

The common opossum and Virginia opossum are found in the United States, Mexico, Central America, South America and Canada. Though they aren't picky about where they hang out, opossums love trees and will stay aloft in trees as much as possible. They also prefer areas that are wet, like marshes, swamps and streams.

Opossums are nocturnal, which means they are awake at night and sleep during the day. They spend nights searching for food. 

Though they don't hibernate, opossums do slow down during the winter. They live in burrows that they fill with dry leaves or even shredded paper, and fat reserves help keep them warm. In the summer, they will lick themselves and cover their fur in spit to keep cool, according to the Animal Diversity Web

Opossums are known for scavenging though trash. They are omnivores, which means they eat both vegetation and meat, and they aren't picky. In the wild, they will munch on nuts, grass and fruit. They will also hunt insects, mice, wild birds, snakes, worms and chickens. In the city they will eat roadkill and garbage.

Males have forked penises. It was once thought that the reason for this physical feature was that they bred with the female's nose. It was thought that once the babies were born, the mother would sneeze the babies into her pouch. This isn't true. These marsupials breed much like other mammals. 

Opossums reproduce twice a year. Once mating is done, the male, called a jack, leaves and doesn't return. After a gestation of just 12 to 13 days, female opossums, called jills, give birth to up to 20 live young at a time. 

The babies, called joeys, are about the size of jelly beans when they are born. They immediately crawl into the mother's pouch to continue developing. Even as the joeys grow older, the mother will still carry them on her back wherever she goes. They will stay with their mother for about 100 days. Typically, most of the joeys don't survive. Joeys become sexually mature at six to eight months and live for one to two years.

Here is the taxonomy of the common opossum, according to the Integrated Taxonomic Information System:

Kingdom: Animalia
Subkingdom: Bilateria
Infrakingdom: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclass: Tetrapoda
Class: Mammalia
Subclass: Theria
Infraclass: Metatheria
Order: Didelphimorphia
Family: Didelphidae
Subfamily: Didelphinae
Genus: Didelphis
Species: Didelphis marsupialis
Subspecies: Didelphis marsupialis caucae, Didelphis marsupialis marsupialis

While some opossums are endangered or extinct, the common opossum is listed as least concern by the International Union for Conservation of Nature (IUCN). Its population is listed as stable. 

Opossums really do play dead. They will flop down and be very still with their tongue hanging out to trick predators. Sometimes this trick will allow opossums to escape. Playing dead can last up to six hours, according to ADW. 

Like other marsupials, opossums have thumbs, called an opposable hallux, on their paws. These thumbs are on the back feet as well as on the front feet. Their tails are prehensile and can be used to help them climb and hold onto tree branches. 

Though opossums will hiss at humans, they are rarely aggressive, according to The Humane Society

Opossums are immune to snake bites, bee stings and other toxins, according to the National Wildlife Federation.

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