Rays Don't Stray: Giant Mantas Stick Close to Home

Until recently, manta rays — which sail through tropical and temperate ocean waters, looking much like enormous kites — were thought to migrate great distances across ocean basins, as do many of the largest marine animals. Researchers investigated data gathered from tracking devices on the manta rays, as well as chemical and DNA analysis of the rays' muscle tissues. The discovery radically changes scientists' understanding of mantas' habits and carries dramatic implications for their