When it comes to the animal kingdom, anything goes, it seems. From sounds heard miles away to spontaneous sex changes, these little-known facts were probably not discussed in that high school biology class you took.
How do you tell a male oyster from a female one? You don't look under their little oyster skirts to see the difference. In fact, the oyster may not be sure, uh...itself. Oysters will change their gender more than once over the course of their lives. They choose whichever gender is most advantageous for them at the moment. Wreaks havoc with the shoe collection.