The decline of the red knot, a bird that depends upon on the eggs of horseshoe crabs for its survival, recently lead scientists to discover that the crabs numbers were also seriously in decline. In the 1990's, fishermen found that horseshoe crabs served as good bait. They were easy to catch, and they were free. With no regulation in place, fishermen indiscriminately captured crabs, endangering them to the point of a 75% reduction in the horseshoe crab population.
Learn more about the Nature film "Crash: A Tail of Two Species."