05/13/2026
This week, we’re featuring the Virginia opossum.
The Virginia opossum (Didelphis virginiana) is Michigan’s only native marsupial, which means opossums have more in common with kangaroos and koalas than rodents! Marsupial reproduction is more ancient than placental mammals. Gestation only lasts about two weeks, and then tiny underdeveloped joeys find their way into momma’s pouch. Once they swallow one of her 13 ni***es, the babies remain safely attached for nearly two months. When they are better developed - a bit bigger than a mouse - they detach from a nip and get more of a chance to explore. They stick around mom for a while before wandering off on their own once they are about 7” from snoot to tail. If you come across them in the late summer, you may have the opportunity to see a mom carrying her babies on her back after they grow too big to stay in her pouch.
Their body temperature is lower than many mammals, which means they are naturally resistant to diseases such as rabies, which can’t survive at such temperatures. There is also a protein in their blood that makes them resistant to some snake venoms - which is used in research for developing improved antivenoms. These are unique developmental traits that they have evolved with over thousands of years.
Opossums also have more teeth than any other North American land mammal, with a total of 50 teeth. This helps them look scary when they are alarmed, and also helps them to eat a wide variety of foods. They are omnivores and opportunistic feeders and will eat just about anything from insects to carrion in addition to vegetation. Their prehensile tails provide balance and support for climbing - which they love to do - and also can be used to gather leaves and debris to make a cozy nest!.
We are at the northern end of the opossum’s range, which stretches all the way south into Central America, but not past the Mackinac Bridge. In fact, there was a news article about the opossum rescued from the bridge in 2025!
Opossums are an essential Northern Michigan species, and we hope you look at these unique creatures with new insight and appreciation. What is your favorite opossum fun fact? Let us know in the comments if you want to learn more about opossum evolution, anatomy, or behavior!