2 Types of Seals in Oregon

Harbor Seals are small to medium-sized pinnipeds, typically 4 to 6 feet long, with a chunky body and a small head that seems to sit directly on their shoulders. They have mottled gray, brown, or tan coats with darker spots and pale bellies. Their face is rounded and whiskered, and their eyes are large and forward-facing. Northern Elephant Seals are much larger, with adult males reaching 12 to 16 feet in length and weighing up to 5,000 pounds; females are smaller at around 8 to 10 feet. Males have a distinctive inflatable snout that resembles an elephant's trunk, which they use for social displays and communication. Females lack this feature and have a more streamlined snout. Both species have hind flippers that cannot rotate forward under their body like sea lions can, so they move on land by using a galumphing, undulating motion powered by their core muscles.

Harbor Seals are by far the most abundant seals in Oregon, with thousands of observations recorded annually in iNaturalist data. They are present in Oregon waters every month of the year, though numbers fluctuate seasonally. Northern Elephant Seals are much rarer, accounting for only a small fraction of sightings compared to Harbor Seals. When Northern Elephant Seals do appear in Oregon, they are typically sighted during their migration periods and are concentrated in specific locations along the coast, particularly in rocky outcrops and offshore haul-out sites.

Harbor Seals are found throughout Oregon's marine and estuarine environments. They haul out on rocky reefs, sandy beaches, river sandbars, and small rocky islands. Some of the most reliable viewing locations include the Columbia River Gorge tidal zones, coastal river mouths, and rocky coastal headlands. Many are also found in bays and estuaries where freshwater rivers meet the ocean, allowing them to forage in both saltwater and brackish environments. They tend to favor areas with nearby food sources and places to rest safely on land.

When swimming, Harbor Seals are highly maneuverable and often hold their heads above the surface at a steep angle, with only their face visible. This upright posture in the water is one of their most distinctive field marks and differs markedly from sea lions, which rarely hold this vertical position. Look for a small, spotted head; they typically move slowly and deliberately through the water, and may approach observers with curiosity. Their large eyes are easily visible when they surface, and their whiskered face is unmistakable. Listen for their vocalizations, which are far quieter than those of sea lions and sound more like grunts, growls, or bells.

Peak seal sighting season in Oregon is from May through July, with June being particularly active. Sightings remain strong into August but decline noticeably from September onward. This timing coincides with breeding preparations, pup rearing, and optimal foraging conditions. April and March also see elevated activity as seals return to haul-out sites after winter. The winter months, December through February, show lower sighting frequency, though seals are present year-round in many locations.

Northern Elephant Seals do not permanently reside in Oregon, but they pass through Oregon waters periodically during their long-distance migrations between their breeding grounds in California and their distant feeding grounds in the North Pacific. These migrations can cover thousands of miles, and a few individuals occasionally strand or rest on Oregon beaches and rock outcrops, especially during transit. Sightings are rare and unpredictable, making Northern Elephant Seals a special find for dedicated seal watchers.

Harbor Seal pups are born with a full coat of fur and are ready to swim within hours. They are born in spring and early summer, typically from March through June. Newborn pups appear small and fluffy compared to adults, with similar spotted or mottled coat patterns but often in lighter tones. Mothers are highly protective and will remain close to pups during the nursing period, which lasts only 4 to 6 weeks. Pups grow quickly and are weaned and independent by midsummer.

Harbor Seals are vocal animals, particularly in and around haul-out sites. Underwater, they produce a variety of sounds including clicks, bells, and chirps for communication. On land, especially during breeding season, they make grunts, growls, and barks. These sounds carry well both above and below water. Northern Elephant Seals produce louder, deeper vocalizations dominated by loud snorts and roars, especially when males inflate their proboscis. If you are near a haul-out site, especially during spring and early summer, you may hear these vocalizations echoing from the rocks.

The Oregon Department of Fish and Wildlife publishes detailed information about seals, marine habitat, and responsible wildlife viewing practices. Their website includes guidance on local regulations and marine mammal viewing etiquette. Local wildlife guide resources for specific regions, such as the Columbia River Gorge and the Oregon Coast, often provide species profiles and seasonal viewing information tailored to those areas. Regional visitor centers and wildlife interpretation sites near seal haul-out areas also offer valuable educational displays and naturalist guidance.

Harbor Seals typically dive to depths of 100 to 300 feet and remain underwater for 3 to 7 minutes while foraging for fish and invertebrates. They are well-adapted to diving with streamlined bodies, efficient oxygen storage in their blood and muscles, and the ability to lower their heart rate during submersion. Northern Elephant Seals are exceptional divers and can plunge to depths greater than 5,000 feet on feeding dives lasting up to 2 hours, though typical dives are much shorter and shallower. This extreme diving ability is one of the most remarkable adaptations among marine mammals and is linked to their far-ranging ocean migrations.