Or, rather, a tail of a whale. I snapped this from a whale watch vessel in February, 2008, off Monterey California. I had only a light jacket and no gloves, and the boat heaved on twelve-to-fifteen-foot swells. I was turning into a block of salty ice!
Thar she blows! Where away? Two points abaft the lee beam! She blows, she blows, she blows!