We have had an unusual amount of humpback whales feeding in the bay this year. I have been sailing the bay since the early 80's and have never experienced this much traffic. It's all do to their food source which is small fish and plankton. This is good news as the waters of the bay are supporting many different types of marine life. Normally, the whales stay out near the Farallon Islands, which are 30 miles west of SF. Take a look at this cool vid.