I don’t know how the groups like Opossums and Bats and Raccoons do it, just have a few species. I don’t know how I’d get something new every day.
Owls are easy because I’ve got 250+ to pick from, even if a lot of them look similar. If I get tired of one, I’ve got options, but how many kinds of different looking possums exist? 3?
A general AnimalFacts could be fun though, and would be able to use cross posting effectively to borrow items from other groups.