Horseshoe Crabs and Sex

These crabs are really rather fascinating. They found evidence of them being around 445 million years ago.

http://www.foxnews.com/story/0,2933,326712,00.html

This link talks about some of the practical uses for horseshoe crabs today.

http://www.thedailygreen.com/environmental-news/latest/horshoe-crab-47021206

And this article shows the crabs when they are mating in large groups.

http://www.youtube.com/watch?v=8uikyxWSMZU&feature=related