"Finding Their Way: How Migratory Creatures Get Where They’re Going: Guest: Charles Walcott, Ph.D., Professor Emeritus of Neurobiology and Behavior; Cornell University. Migratory birds and creatures can navigate vast distances to annual retreats and nesting sites because they are endowed with magnetoreception. Dr. Walcott explains the biological adaptations that enable the connection to Earth’s magnetic field. He describes his pioneering work on the homing pigeon, one of the major sources of evidence for magnetoreception. Dr. Walcott also discusses some other interesting sensory mechanisms, such as how spiders “hear” with their legs.