FILE - In this May 18, 2006 file photo provided by the U.S. Fish and Wildlife Service, walrus gather on an ice flow in the northern Bering Sea off of Alaska. A partial federal assessment of Pacific walrus estimates their minimum population at just 15,164 but says the count likely missed a number of animals. The estimate released Thursday, June 18, 2009, in response to a court deadline only represents animals counted in about half of walrus habitats in the Bering and Chukchi seas and does not account for animals that were in water rather than out on ice.