Now, I know I've already explained how quokkas are dangerous, depraved animals, but let's face it: Cockatiels are tiny dinosaurs who DON'T want to — and frankly couldn't — kill you. I mean, they can't get rabies. They're tiny dinosaurs who want to sit on your shoulder, cuddle with you, maybe chew on your hair a bit.
In fact, the most pissed off a cockatiel will get at you is to nibble you on a little bit. But let's be serious, how bad is a nibble? Clearly not that bad. Quokkas, on the other hand, have really big pointy teeth and the ability to bite hard.