Apr 09, 2021 11:58 AM EDT As sea ice melts earlier in the year due to climate change, polar bears have begun their hunt for food on land, like bird eggs. They are not too good at it, a recent drone-based study shows. That could be another bad sign for the ability of bears to survive in a changing world, researchers say. (Photo : Getty Images) Behavior of Animals Robert Rockwell, an ecologist at the American Museum of Natural History who has learned about polar bears for 50 years said: "This is a really elegant study." the team's drones use an "excellent" way to notice the behavior of animals.