Heatwaves can be dangerous affairs, intolerable to deadly, especially for those who don't have access to air conditioning or a body of water to cool off. But these extreme events aren't limited to land-dwellers: Ocean animals also endure streaks of stifling temperatures, known as marine heatwaves, that can persist for months and seem to be growing more common as the climate warms. Up until now, most research on marine heatwaves has focused on stationary organisms like coral reefs that have no choice but to endure the heat—and often perish. But a new study conducted by researchers at the National Oceanic and Atmospheric Administration examines how mobile species like fish respond to these climatic events. Published today in Nature, the study found that marine heatwaves can raise the temperature of hundreds or thousands of miles of cold-water habitat, forcing wildlife to quickly move to cooler areas to survive. “In past marine heatwave events along the West...