Green turtles spend most of their lives in the same place, feeding on seagrass in the shallow waters of the area. Every few years, they migrate to areas a few kilometers away to breed, and return to their original habitat a few months later. Scientists installed GPS (Global Positioning System) trackers on the bodies of 33 female green turtles and found that these turtles did not have enough food on the high seas, so they could only swim back to their original habitats after leaving their breeding grounds. However, almost none of these turtles can follow the ideal route. After a short rest on the small islands on the way, they all deviated from their destination when they re-started, so they had to travel a long distance to return to their original habitat. Scientists speculate based on the route tracked by the GPS tracker. These green turtles use a rough sense of direction to navigate based on the existing route map in their brains, so they can go in the roughly correct direction when they start, but they may eventually deviate from their purpose. The ground is far away.