Common and thick-billed murres ("Uria aalge" and "U. lomvia", respectively) dominated the diet around the Sea of Okhotsk, followed by black-legged kittiwakes ("Rissa tridactyla"), slaty-backed gulls, crested auklets ("Aethia cristatella"), and pelagic cormorants ("Phalacrocorax pelagicus"). Small chicks of murres and cormorants were sometimes taken alive in Russia and brought back to nests, where they independently fed on remains of fish in the eagles' nests until they were killed themselves. In Russia, upland grouse, such as black-billed capercaillie ("Tetrao parvirostris") and willow and rock ptarmigan ("Lagopus lagopus" & "L. muta") can be an important prey species; grouse are not typically taken by other "Haliaeetus" species. Other landbirds hunted by Steller's sea eagles have included short-eared owls ("Asio flammeus"), snowy owl ("Bubo scandiaca"), carrion crow ("Corvus corone") and common raven ("Corvus corax"), as well as (rarely) smaller passerines. In one case, a Steller's sea eagle was observed feeding on a great albatross (genus "Diomedea"), a rare vagrant from the sub-Antarctic oceans. This sea eagle may supplement its diet with various mammals (especially hares), crabs, mussels, "Nereis" worms and squid when given the opportunity.