Pacific harbor seals – ‘The Dogs of the Sea”
Pacific harbor seals have spotted coats in a variety of shades from white or silver-gray to black or dark brown. They reach five to six feet (1.7-1.9 m) in length and weigh up to 300 pounds (140 kg). Males are slightly larger than females. They are true or crawling seals, having no external ear flaps. True seals have small flippers and must move on land by flopping along on their bellies. In San Francisco Bay, many harbor seals are fully or partially reddish in color. This may be caused by an accumulation of trace elements such as iron or selenium in the ocean or a change in the hair follicle.
More information at The Marine Mammal Center Site.