sentences:  The most prevalent species are common murres, tufted puffins, rhinoceros and Cassin's auklets, pigeon guillemots, Leach's storm-petrels, several species of gulls, and Caspian terns.Four species of pinniped breed, molt, and rest on these lands, including harbor seals, Steller and California sea lions.The southern portion of the refuge provides the greatest number of breeding and pupping sites for Steller sea lions in the U.S. outside Alaska.