Lauren Sommer
Source: 89.3 KPCC
December 28, 2011

"A sight that hasn't been seen since before World War II is making a welcome comeback beneath the most famous bridge in Northern California. Harbor porpoises are showing up in growing numbers under the Golden Gate Bridge. Six decades ago, they were driven away in part by wartime activities and poor water quality; now, researchers are trying to understand why they're returning."

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