Most opossums (as drawn) are of the D. virginiana variety. Most often found in the U.S.A. east of the Mississippi River and south from Arkansas and eastern Texas into Central America's Panama. There's a couple unrelated species in Australia, but they don't belong to the Didelphis genus.
Link
Amethystine
A fine specimen of Didelphis marsupialis, reading a fine example of Comicus arthropodis! :D