Critical habitat is defined as all necessary for the recovery of the species.
It is protected from destruction or adverse modification. In northern Canada, native diets have long included seabirds, from British Columbia to Newfoundland. Murre eggs are still a major food source for certain Inuit communities in Canada. Steller's eiders are diving ducks that feed primarily on mollusks and crustaceans, including the common blue mussel and the sand-hopper. During the breeding season, they also eat insects and plant materials.