Get More Information Sea otters spend much of their lives in the
water and can dive up to 330 feet when foraging for food. They
sometimes rest in coastal kelp forests, often draping the kelp
over their bodies to keep from drifting away. Featured: Sea
Otter Footage of the Sea Otter courtesy of the US Fish and
Wildlife Service. Defenders Web Pages Height: Length California
sea otters: 4 feet; northern sea otters are slightly larger.
Weight: 45 lbs (females); 65 lbs (males). Northern sea otters
can reach up to 100 pounds. Lifespan: 10-15 years (males); 15-20
years (females)