Harbor porpoises are returning to San Francisco Bay in increasing numbers after having evacuated the area during Word War II.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/iy165Xi8zYs" height="1" width="1"/>
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Harbor porpoises are returning to San Francisco Bay in increasing numbers after having evacuated the area during Word War II.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/iy165Xi8zYs" height="1" width="1"/>