Thousands of sea birds were seen flying across the bow of the Kitty Kat catamaran while on the SF Bay Whale Watching Tours nature tour.

Thousands of birds dotted the sky like moving pepper as the boat cleared the Golden Gate bridge.

A close up of several sea birds floating on a fairly calm sea surface just off the coast of San Francisco.

With Baker Beach behind, as the boat began to turn just off the coast of San Francisco, hundreds of bird were landing and taking off.

Behind the huge flock of sea birds, the buildings of the city were shrouded in fog.

A close up shot (through thin fog) of many cormorants roosting on the side of the cliffs of Alcatraz Island taken while on the nature cruise of the SF Bay Whale Watching Tours company.