Harbor Seal Pup (Phoca vitulina). While watching a mother harbor seal and her pup swimming, they jumped out onto the nearby rocky shore to rest and thermoregulate. The pup was a little off balance when this shot was taken. Harbor seals are nocturnal hunters and tend to rest during the day, while hunting at night. Of course as any parent knows, this changes when you have a baby. And this baby had no intention of resting.