So, one of the webcomics I like to read is The Oatmeal. I learned something from The Oatmeal a couple weeks ago when I read this:
http://theoatmeal.com/comics/angler
(Caution - this comic is highly addictive, and tends to have very NSFW language. Don't click if you like things to be G-rated all the time.)
Anyhow, so, deep sea anglerfish have a very unusual mating cycle. The males are drawn to the females by scent (since it's hard to see down there), when they find them, they bite onto the female and stay there. Eventually they melt into the skin of the female and everything on the male eventually atrophies except for the male sex organs. A female might live her life with 6 or 7 different pairs of testes hanging off her skin.
For real. Check it:
http://animals.nationalgeographic.co...nglerfish.html
Crazy stuff.