Duck-style kung fu (duck fist?) - is this a real thing?

That’s a new one to me. I just hunt Canadian Geese.

I used to have some cockatiels when I was a kid.

The males would sometimes try to mate with unwilling females (one of the males would pretty much try to mate with inanimate objects and anything that stood still long enough). They’d get bitten hard and chased away.

TBH, cockatiels can be quite aggressive when they want to be. Their bites can take chunks out of your fingers.