With the red knots around for only a few weeks, these researchers have a limited window for collecting data.

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 U.S. State of the Birds report reveals that one-third of our nation's birds are in trouble. But Allison Argo feels optimistic. At least now the issue is getting attention.

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?

Even as our actions have imperiled the red knot, we can also preserve the species, by regulating the fishing industry and keeping clear of the beaches that the knots rely on during migration.

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