USGS scientists scan the ice for resting walruses
Sarah Sonsthagen (left) drives a skiff as Tony Fischbach scans the ice for resting walruses to radio-tag. On an hourly basis, these instruments show whether the walrus is in the water, resting out of the water, or foraging at the seaﬂoor. The radio tag will fall off after 3 to 12 weeks. Screenshot from video "Tracking Pacific Walrus: Expedition to the Shrinking Chukchi Sea Ice."