Dr. Larry Niles on the state of the red knot and what we can do to help.

The horseshoe crab's unique blood has powerful properties valued by the biomedical industry.

In this behind-the-scenes podcast, filmmaker Allison Argo discusses the importance of protecting small species.

The horseshoe crab has been on Earth for 350 million years. An ancient and complex anatomy hides within its domed shell. From its 10 eyes to its tube-like heart, the horseshoe crab's unique physique may surprise you.

The red knot makes one of the longest migrations of any animal. To accomplish this feat, it relies on the eggs of the horseshoe crab. Without these eggs, the red knot is in danger.

The horseshoe crab's annual spawning produces millions of eggs that are the lifeline for a tiny bird called the red knot. Watch the full episode now.

The horseshoe crab is at the center of a contentious debate, and one that plays the world over. How do we find the balance between man and nature?

To fight off infection, the horseshoe crab has a compound in its blood -- LAL, or Limulus Amebocyte Lysate -- which immediately binds and clots around fungi, viruses, and bacterial endotoxins.

View additional resources, online and in print, for NATURE's "Crash: A Tale of Two Species."

Download the Teacher's Guide for NATURE's Crash: A Tale of Two Species.