Some species of migratory birds that feed on the eggs of [horseshoe crabs](http://en.wikipedia.org/wiki/Horseshoe_crabs “Wikipedia”) may soon disappear because of the rapid decline in the numbers of horseshoe crabs.

[Read](http://news.nationalgeographic.com/news/2006/04/0418_060418_crab.html?source=rss) (National Geographic)