The Northern fur seal is the smallest member of the family in Oregon. The flippers are nearly twice as large as those of a comparably-sized individual of any other species of otariid. The ears are cylindrical and the auditory meatus is covered with wax to prevent entry of water. The pelage consists of coarse guard hairs and an exceedingly thick underfur that serves as waterproof insulation. Adult males are dark gray or brown dorsally and reddish brown ventrally; a grayish cape covers the neck and shoulders. Adult females are grayish brown dorsally and reddish brown ventrally.

The Northern fur seal is restricted largely to the waters and some insular areas of the North Pacific region. In Oregon, it occurs mostly along the northern coast.

They typically feed at night and during crepuscular hours because their prey migrates toward the surface at dark. They generally rest and sleep on the surface during the day, although they may feed if prey is available.

Photo by Don Henise, Flickr