Not always the same trip, but we've seen:
Ducks (Some Mallards but others as well), Rabbits, Squirrels, Geese
Alligators, Armadillos, Deer
No: Cats(not at WDW), Snakes of any kind, Crocs (except the rubber kind that go on peoples' feet. LOTS of those!

)
We've been a number of times, and although I don't spend a ton of time scouting, I do try to keep my eyes open.
One trip we saw aton of armadillos, but haven't seen any for sveral trips - and I've been looking. I think maybe DIsney did somethig to control them.
I've only seen a gator once. It was a little one, though we saw it more than once. I think we saw it twice in the same area. I fairly certain it was the same one. I've seen other gators off property, too.
I'm not going to count the offsite wildlife places I've been, or the intentional animals in AK...but you may well see lots of birds, on the coast are pelicans, all over are black vultures. I'm trying to remember when and where, but I'm pretty sure we smelled skunk one night..It may have been offsite in Orlando. Of course the many lizards, and frogs.
Just off I-Drive (near Universal), and just north of Orlando are cows and horses. Florida is actually a big cow state! To the southeast of WDW are large orange groves.