Such as: if you want to have nightmares for a few years, you'll watch a video of a duck penis becoming erect. Or the fact that panda dicks, fully erect, are only about the length of the human thumb. And not like one of those people who have like real long thumbs. We're talking maybe an inch maximum. For a fairly big animal, that's a decidedly tiny wiener.
Here's some other fun sexy facts about the animal kingdom for ya'll to enjoy.