Meanwhile, on the Golden Gate Bridge…

Marine Biologists Solved a Wildlife Mystery From the Walkway of the Golden Gate Bridge: How the Harbor Porpoise Mates smithsonianmag.com

Harbor porpoises vanished from San Francisco Bay for decades, returned in 2008, and have now been watched mating from the walkway of the Golden Gate Bridge — the first close look at how the notoriously shy animals actually do it. The vantage point solved a question boats and tags could not.