Supernormal stimuli make birds ignore their eggs (and then their chicks), cause fish to fight dummies (while live competitors go uncontested), and can drive humans back to sugary snacks. Find out how these special stimuli use just the right trigger to make an animal destroy itself.
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…
