Learn about the anatomy and ecological relationships of the horseshoe crab.

Interesting facts and figures about horseshoe crabs, including information about mating, reproduction, pictures, and a link to the University of Delaware's page on Horseshoe Crabs.

Resource is filled with lots of information presented in an easy to follow format. Illustrations are excellent.

This site gives an in-depth description of a daddy long legs, including its behavior, appearance, reproduction, and classification. The site includes photos and illustrations and an interactive quiz to test your understanding.

This video segment from NOVA: "The Mystery of Animal Pathfinders" explores how the migratory patterns of shorebirds have evolved to coincide with the spawning of horseshoe crabs. [6:00]