The islands in the Sea of Cortez are chunks of tectonic debris that highlight the violent geological history of Baja California. In this episode, travel along the coastline of Espiritu Santo Island with host David Yetman, researchers from the Arizona-Sonora Desert Museum and a group of international scientists. Kayak around the island and visit extremely vocal sea lions and navigate the rock canals near the shore of the island that were created in the early 20th century for the pearl oyster trade. On the island, trace tree roots that snake down the canyon walls in search of water and discover a completely new species of beetle crawling across the boulders. Before leaving the island, cross paths with an enormous pack of fiddler crabs scudding their way to a new location.