Harbour Seal (Phoca vitulina)
- These are “true seals” of the Phocidae family, also sometimes called “common” or “hair” seals.
- They are covered with short, stiff, bristle-like hair. Colouration varies, but two basic patterns occur: light grey sides and belly with dark blotches or spots or a dark background with light rings.
- Only a small hole on either side of their heads, with no ear flaps, distinguishes them from sea lions.
- Harbour seals have a metabolic rate higher than land mammals of similar size, allowing them to generate a greater amount of body heat.
- They are good swimmers. However, on land, they move awkwardly by undulating in a caterpillar-like motion because their pelvic bones are fused.
- They can remain submerged for over 20 minutes. Oxygen-conserving adaptations that allow such dives include high blood volume, reduced peripheral circulation, reduced heart rate, and high levels of myoglobin (the oxygen-binding protein in muscle).
- Harbour seals periodically emerge from the water to rest, give birth, and nurse their pups. In winter, they spend up to 80% of their time in the water.
- Young pups are able to swim almost immediately after birth. Mature females mate shortly after weaning their pups. The embryo’s development is suspended for about 11 weeks, a trait called embryonic diapause (i.e., delayed implantation).
- Diet: Fishes, octopus, and squid.
- Behaviour: Usually solitary in water, but haul out in groups of a few to thousands.
- Range: The North Atlantic and Pacific oceans. Alaska’s coast extends from Dixon Entrance north to Kuskokwim Bay and west throughout the Aleutian Islands.
- IUCN status: LC.

Credits: Alskasealife
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