Harbor Seals inhabit the Northern Atlantic and Pacific Oceans and the Baltic and North Seas but generally stay close to the coast.

Tend to be site faithful. That is, they stay with the same resting, haulout and birthing site.

They are generally 5-6 feet long and weigh up to 300 lbs., with males being slightly larger than females.

There are approximately 40,000 Harbor seals along the California Coast.

Color of the seals has many variations − from white or silver-gray to black or dark brown. They can have spots − colors and spots are unique with the individual and can be used to identify individuals.

Harbor seals can dive to 1500 ft and stay under for up to 40 minutes − average dive lasts 3-7 minutes.

Their hair does not provide insulation. There is a thick layer of blubber-fat − which insulates the seal.

In cold water blood vessels constrict slowing the flow of blood to the skin and reducing heat loss. When hauled out the process is reversed and blood vessels expand allowing heat to be released to the environment.

There are glands in the skin that secrete oils which protect the coat. Because of this harbor seals must molt annually − molting occurs after every breeding season.

Courtship and mating occur underwater but we don't know much about the mating system although they are thought to be polygamous.

Mating usually occurs after weaning of the pups.

Females bear a single pup which they care for alone.

Pups are mostly born on shore.

Mothers nurse 4-6 weeks.

Pups weigh up to 20-24 lbs.

Pups are well developed when born and can swim and dive within hours.