Join researchers Bill Keener and Isidore Szcepaniak of Golden Gate Cetacean Research on the harbor porpoises of San Franciscso Bay and the outer coast off San Francisco. Hear the good news: they're back, after an absence of 65 years! Learn about the ongoing research, in partnership with the Farallones marine sanctuary, to find out why. And how they live. And how they mate; and theories as to why they left, and why they've returned. Discover how to report your own porpoise sightings!
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