"She-Crabs Are World's Pickiest Daters"
http://news.nationalgeographic.com/news/2005/08/0804_050804_crabsex.html
^^^^^^^^ Heh, check out the last word in the URL.
Back to the, um, serious science:
"Few males pass the muster of the female California fiddler crab-perhaps the world's pickiest dater. According to a new study, the lady crustaceans may size up more than a hundred suitors, and the burrows where they live, before finding Mister Right."