SEAL SPECIES
Seals dot the Delaware beaches, frequently just looking for a spot to rest after feasting on various fish, shellfish, and crustaceans near the ocean floor.
![seals | merrinstitute (1) seals | merrinstitute (1)](https://i0.wp.com/static.wixstatic.com/media/de914a_cc6bab5d172844599da27daa3874457d~mv2.jpeg/v1/crop/x_0,y_51,w_1024,h_577/fill/w_953,h_537,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/harborseal.jpeg)
Harbor Seal
(Phoca vitulina)
Anatomy:
Lack external ear flaps; blue-gray in color with light and dark speckles; have short forelimbs; short, concave snouts
Size:
Adults are about 6 ft in length and can weigh up to 245 lbs
Behavior:
Haul out on land; rest with head on surface and flippers elevated
Prey:
Fish, shellfish, crustaceans
Reproduction:
Mate at sea; gives birth during the spring and summer months; pups are nursed for about 24 days and can swim right after being born
Location:
Temperate coastal habitats; non-migratory; occur on both east and west coasts of the U.S.; most common seal found along the U.S. east coast
Status:
Candidate
Threats:
Entanglement in fishing nets, pollution, human disturbance
Harbor Seal
(Phoca vitulina)
![seals | merrinstitute (2) seals | merrinstitute (2)](https://i0.wp.com/static.wixstatic.com/media/de914a_223a9d2a2b8740ab9b2f4e393f449936~mv2.jpeg/v1/crop/x_0,y_53,w_1024,h_577/fill/w_143,h_81,al_c,q_80,usm_0.66_1.00_0.01,blur_2,enc_auto/Juvenile_Harp_Seal_(8590145751).jpeg)
Harp Seal
(Pagophilus groenlandicus)
Anatomy:
Lack external ear flaps; robust body with small, flat head; narrow snout with eight pairs of teeth in upper and lower jaws; front flippers have strong claws; back flippers have smaller, narrower claws; light gray in color with a black face and harp shaped black saddle on their backs (refers to common name); pups have long, white fur and molt as they grow older
Size:
Adults are 5-6 ft in length and can weigh about 300 lbs; pups are less than 3 ft when born and can weigh about 25 lbs
Behavior:
Seasonally migrate in large groups; migrate north to Arctic summer feeding grounds after molting; maximum dive depth is 1,200 ft; maximum dive duration is about 16 minutes; use their front flippers to move along the surface of the land
Prey:
Small fish and krill
Reproduction:
Females give birth from late February to mid-March; pups nurse on milk for 12 days to acquire blubber
Location:
Found in pack ice in North Atlantic and Arctic Oceans; can occur from Maine to Delaware:
Threats:
Hunting, entanglement in fishing nets, habitat destruction, pollution, human disturbance
Harp Seal
(Pagophilus groenlandicus)
![seals | merrinstitute (8) seals | merrinstitute (8)](https://i0.wp.com/static.wixstatic.com/media/de914a_b45be21ecd5a45aeabaf008a2eca5733~mv2.jpeg/v1/crop/x_0,y_45,w_1184,h_667/fill/w_143,h_81,al_c,q_80,usm_0.66_1.00_0.01,blur_2,enc_auto/Grey_seal_Halicho*rus_grypus_young.jpeg)
Gray Seal
(Halicho*rus grypus)
Anatomy:
Females are a silver-gray in color with dark spots; males are dark gray in color with silver spots and a long, arched nose; pups are composed of white fur for three weeks until they molt; lack external ear flaps; short forelimbs
Size:
Adults can be 7.5-10 ft in length and can weigh between 550-880 lbs; pups weigh about 35 lbs when born
Behavior:
Males compete for females; maximum dive depth is 1,560 ft; are often found in a vertical position in the water with just their heads showing; social feeding is often used
Prey:
Fish, crustaceans, squid, octopus, seabirds
Reproduction:
Gather in large groups for mating; males compete with each other for females; gestation period for females is 11.5 months; pups are born in January-February
Location:
Found in coastal waters; Western north Atlantic, Eastern north Atlantic, Baltic Sea; can be found on sandbars, icebergs, islands, ice shelves, and rocky coasts
Threats:
Hunting, pollution, entanglement in fishing nets, human disturbance
Gray Seal
(Halicho*rus grypus)
![seals | merrinstitute (9) seals | merrinstitute (9)](https://i0.wp.com/static.wixstatic.com/media/de914a_aad9b655ebcc458e9c3127c6c99f3b45~mv2.jpeg/v1/crop/x_0,y_99,w_856,h_482/fill/w_143,h_80,al_c,q_80,usm_0.66_1.00_0.01,blur_2,enc_auto/Hooded_seal_crop.jpeg)
Hooded Seal
(Cystophora cristata)
Anatomy:
Adults have silver-gray fur with dark blotches, and a black head; pups are blue-gray in color; adult males have a bi-lobed nasal cavity called a hood that when inflated is red in color to attract females and scare away other males
Size:
Males can be 8 ft in length and weigh up to 660 lbs; females can be 7 ft in length and weigh up to 440 lbs; pups are 3 ft when born and weigh about 55 lbs
Behavior:
Migratory and can drift long distances; unsocial; aggressive and territorial; dive to about 325-1,950 feet deep for 15 min
Prey:
Crustaceans, squid, fish, starfish, and mussels
Reproduction:
Spring is when they gather to breed for 2-3 weeks; pups are weaned in 3-5 days after birth; molt before starting migration for the year
Location:
Found on pack ice and in deep waters; colder climates are the best for their survival; inhabit the North Atlantic and Arctic Oceans
Threats:
Hunting, entanglement in fishing nets