These are real North American Oppossum (Didelphis virginiana) skulls! These specimens are available exclusively in Canada.
Opossums are the largest members of the marsupial infraclass in the Western Hemisphere.
There are 103 known species of opossum around the world! The largest opossums are slightly larger than a big house cat, while the smallest members of the order are roughly the size of a small mouse. Most species of opossum are omnivores, with a very adaptive digestive system that allows them to take advantage of many sources of food, including human garbage.