Rapid Deevolution Creates Lake of Fully-Armored Fish in Just 50 Years

Lake Washington, the largest lake in the Seattle area, has long been home to a soft-skinned fish called the threespine stickleback. But over the past fifty years, the lake's population of sticklebacks has changed dramatically: today, most of the fish sport partial or full body armor, a throwback to their origins as… » 5/15/08 3:00pm 5/15/08 3:00pm