Yeah, animals would be good. Or at least some general ideas on how to stat them. They do actually come up, after all.
I mean, at what point do you give an animal Inhuman or Supernatural Attributes? Do you give hem Powers at all? Moe doesn't have them (despite Gorillas, as a rule, being definitively stronger than people), but some critters need them to work. For example I'd personally give an Elephant Supernatural attributes on par with an older Gruff, but is that actually reasonable?
Clearly (due to Moe), we know more or less what a gorilla looks like, but what about a rottweiler, a wolf, a kodiak bear? Hell, what about a particularly mean house cat. We don't even have stats for Mister. Eight or nine brief statblocks (probably 7 or 8 skills a piece, and two or three Stunts and powers) like say, Dog, Cat, Wolf, Bear, Raven, Bird of Prey, Big Cat, Elephant (or something else exotic), Dolphin, and Shark would give some actual scope to how animals work.