I watched a looot of Animal Planet when I was a kid, so I didn't have many illusions. I could never figure out how the fuck birds did it, though. I figured that male birds must have extendable bits somehow, but female birds have a tail in the way.

We kept ducks when I was a kid, and during the time that we kept a mallard, he would straight up stand on the female duck's backs, and that struck me as terribly inefficient. To support this, none of the female ducks ever laid fertilised eggs, so I figured he was just terrible at it.

Little did I know about the horrifying intricacies of duck mating. I'll thank the internet for informing me in later life... Yeesh.