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00:05:20
Every night at Fort Funston, after all the people and dogs have left for the day, the bats come out to play. Dr. Gary Fellers of the U.S. Geological Survey tells us about bat vocalizations, the audio recordings he uses to monitor their travels, and the various species of bats that frequent this Golden Gate National Park.

00:41:34
Produced by students from San Francisco's Aim High Program. Today they ask, how do our ears work? Can we communicate without words? How do whales communicate under water? Why don't bats slam into trees as they fly? Middle school students will interview Exploratorium Educator Ken Finn and Biologist Dr. Karen Kalumuck, plus special surprise guests!