How many opossums are required to make a passel?

This is a fun question! While "passel" is a word that generally refers to a large group of things, there's no official, standardized number associated with it, particularly for opossums.

It's more of a playful term, like "a gaggle of geese" or a "pod of dolphins." You could say a "passel of opossums" to describe a large group of them, but the exact number wouldn't be defined.