The average adult male northern fur seal is 6.5 feet long and weighs 300 to 600 lbs. The average female is 4.2 feet long and weighs 65 to 110 lbs. Adults have thick fur and long hind flippers, are silver-gray to brown in color, and have white whiskers.
While at sea, these seals sleep with their nose, both hind flippers and one front flipper above water.
Male Steller's sea lions average 9 feet long and 1,500 lbs. Average adult females are 7 feet long and 600 lbs. They have large, bulging eyes, a square snout and a powerful, robust body.
Steller sea lions are thought to be able to dive 600 feet below the surface.
The average adult harbor seal is 6 feet long and 250 lbs. This seal has a torpedo-shaped body, large, round heads and short limbs.
In the water, harbor seals usually keep to themselves. But they usually emerge in large groups--thousands come out of the water together.
The adult ribbon seal usually weighs about 150 lbs. and is about 5 feet long. This seal is medium-size and has a distinct ribbon color pattern on its fur; all ribbon seals older than 1 year have light bands on a dark background that encircle the neck, each front flipper and the torso.
These seals are seldom seen in water. They run across the ice, alternating their front legs and swinging hindquarters, instead of waddling like most seals