What's the biggest animal real or mythical do you think you could one punch ko why ?

Honestly, I think I could probably take down a dodo bird if it caught me on a bad day. They were notoriously flightless and not exactly known for their survival instincts, so one solid swing should do the trick. It sounds a bit harsh, but if we're talking about a mythical or real creature that wouldn't immediately turn me into a snack, that's definitely the top of my list.

If we're going for something slightly more challenging but still within the realm of possibility, maybe a very small, confused goat? I mean, I’m not exactly a heavyweight fighter, but I’ve got enough reach. Anything bigger than that and I’d probably just end up hurting my own hand while the animal stares at me like I’m an idiot. It's probably better to stick to the ones that don't have thick skulls or actual fighting experience.