A private team of researchers are observing the movements of more and more porpoises as they make their under the Golden Gate Bridge and into the bay. It seems they are following their prey but once inside may be intrigued by the large amount of crab and other fish that seem to be present these days. The porpoises, who can live up to 12 years, are a good sign of the overall health of the bay—positive news in a time of pessimism over other environmental calamaties.
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