The most widely distributed seal in the world
Harbor seals are compact, spotted, and famously dog-faced, with a rounded head and no external ear flaps, the trait that separates true seals like this one from sea lions. They’re the most widely distributed pinniped species on the planet, and the range data here shows why: records span both the Pacific and Atlantic coasts of the United States, from Alaska and California to Maine and the Carolinas.
A generalist fish hunter
Recorded prey for harbor seals includes salmon of several species, lingcod, mullet, midshipman, rainbow trout, and even giant Pacific octopus, a diet that’s roughly 80 percent fish and 20 percent invertebrate. That flexibility lets them exploit whatever’s locally abundant, whether that’s a salmon run in the Pacific Northwest or bottom fish along a rocky Atlantic shoreline. They haul out on rocks, sandbars, and increasingly urban waterfronts to rest between hunting trips, rarely straying far from shore.
Hunted by orcas, sharks, and even other seals
Harbor seals appear in the food-web data as prey for orcas, great white sharks, and Pacific sleeper sharks, all animals capable of taking an adult. More surprisingly, grey seals also show up as a documented predator, a reminder that not every threat to a harbor seal comes from a different family entirely. Records peak in July, when seals haul out in the largest numbers to molt and pup.
A long life for a fairly small seal
A harbor seal can live an unusually long time for its size, with the oldest recorded individual reaching nearly 48 years. Females mature around age three, males around four, and a single pup is born each year after a gestation of roughly 253 days. The IUCN lists the species as Least Concern, consistent with a population recorded in such large numbers across so much of the US coastline.
