The cause is unknown. SeaWorld Beached Animal Rescue and Rehab. When visiting, please be respectful of the newborns and mothers. Seals are sensitive to sudden noises and intrusions into their rookery. This rookery is protected by Federal law.
Harbor seals give birth to a single pup on land.
At this latitude the pupping season is February through April. Female seals gestate for 9 - 11 months. There is a period of 1 - 3 months of delayed implantation of the fertilized egg. This ensures pups are born at the same time each year. Mothers and pups bond mainly through scent by touching noses, as well as through sound.