We just returned from a wonderful trip to Alaska. Out near Glacier bay, the humpbacks were frolicking about with their young. We took a boat trip out to watch them play.
The picture below was taken at a fairly high ISO at about 450mm. The boat was rocking a good bit, so not as clear as I would like, but overall not bad.

After his mom called him in from playing, another adult dove right near the boat and gave me the perfect opportunity to get a rather nice fluke shot off.
