In this file photo, a sperm whale calf swims next to its mother and a pod of sperm whales June 15, 2001, about four miles off the coast of the Agat Marina in Guam. Sperm whales have learned to pluck sablefish from fishing lines being hauled from the depths of the Gulf of Alaska, showing a dexterity that belies their enormous size and toothy, underslung jaws.
(AP Photo/Guam Variety News, Chris Bangs, File)