High tolerance of carbon dioxide in their tissues. Ability to store large amounts of oxygen in the muscle tissues. Ability of their lungs to collapse when air is expelled before diving. These special adaptations prevent the seals from getting the bends. Gestation can last up to 10 months due to delayed implantation.
Young seals become tame within moments after birth.
A harbor seal's average life span is 20-25 years. Limited commercial use has been made of their skins for leather or other ornamental purposes. Killer whales and polar bears are their greatest natural enemies. Related Websites Baby seals do not know how to swim and must be taught. True seals power with their hind limbs when they swim, and steer with the front - the reverse of sea lions.