Here is a slow-mo video of a scientist making a duck have sex with corkscrew-shaped beakers. It is one of the craziest things I’ve ever seen. Merry Christmas! You’re going to want to check out Carl ...

Female ducks have evolved an intriguing way to avoid becoming impregnated by undesirable but aggressive males endowed with large corkscrew-shaped penises: vaginas with clockwise spirals that thwart ...