This study makes use of radio tags to monitor changes in walrus movements, breeding, and hunting. Under this research initiative, USGS has documented movement patterns and foraging behaviors of more than 400 walruses to reveal important summering habitats that coincide with areas leased by the Bureau of Ocean Energy Management (BOEM) for oil and gas development. USGS estimated monthly distributions from this tracking data and has made them available to support management needs (For example see Arctic ERMA).