Tracking sharks and dolphins in order to study their habits is tough. Doing so requires researchers to attach some sort of sensor or robot to the animal, but it has to be able to stay on underwater and withstand fast swimming speeds as well as twists, turns and bends. So far, that's been hard to accomplish. But researchers at Beihang University, Harvard University and Boston College have developed a robot that hang on to slick skin underwater and withstand high speeds and sharp movements. They did so by modeling it after an animal that does those things naturally -- the remora. Their work was published this week in Science Robotics.