A possum is a marsupial; a type of mammal where the females carry their young in a pouch. The possum appears to have rat-like features which causes some people to mistake it as a rodent.
Background[]
Marigold Gossum died when she tripped on a possum and fell into her carnivorous blossom. The Kangaroo Rat had a pickled possum for trade for a fragrant blossom.
The Dangling Participle looked to be half opossum. Though opossum is a different species of marsupial altogether.