The blow, the back, the fluke... the jump! To see a jumping humpback whale is high on the wish list of anyone who visits Alaska's Prince William Sound. Humpback whales are baleen feeders, consuming nearly a ton of food a day , mostly plankton and krill. They migrate 6,000 miles to reach their summer feeding grounds in Alaska . Humpbacks average 45 feet and weigh 35-40 tons! On board of the M/V Valdez Spirit of Stan Stephens Glacier- and Wildlife Cruises we spotted sounding, b