Hooked: Wild Boar, Beaver, 2 Bats on drys, Seagulls-many, 3 Cormorants, 2 Grebes, 2 Gannets, Booby, 2 Barn Owls (1 on a Jitterbug LDR'd, 1 on a fly frog), Night Heron, Canada Goose, Mallard duck, Garter snake, Blue Bellied lizard, 3 Pond Turtles, Snapping Turtle, many Bull Frogs.
Some were intentional. Most were not. The Wild Boar probably put up the greatest fight and was intentionally caught on an Apple slice and 40# class rod. If you try this, I suggest using an old pickup as your casting/fighting platform. Standing on the ground w/ a .45 on my hip wasn't as safe as I thought it would be. It was done as "trapping" on a depredation permit. The Beaver, accidentally hooked in the tail on Salmon gear was a close second.
I have a lot fewer "incidental catches" since I've gone to the fly. Maturity will do that to you.

Tight Lines,
Wade