Species Guide

Seals

Earless ("true") seals built for speed and diving — members of the Pinnipedia, a name meaning "winged feet" for their distinctive flippers.

Classification

Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Phocidae (true seals)
Species: ~32–33 species

Quick Facts

Smallest: Galapagos Fur Seal: 4 ft, 65 lbs
Largest: Southern Elephant Seal: 13 ft, 2 tons
Lifespan: 20–40+ years
Diet: Carnivore
Top Speed: 15–18 mph
Status: Varies by species

Habitat & Range

Seals live in almost every ocean, from Arctic waters to the tropics, with the largest concentrations found off California and New England. Most species favor coastal waters and rocky shores, spending roughly half their time in the water and half on land.

Diet & Senses

Seals are carnivores, feeding on fish, crustaceans, and squid — some species also prey on penguins. Their bodies taper from chest to tail and range from brown and tan to white or mottled, with thick blubber in cold-water species and less in warmer climates. Seals rely on a keen sense of smell in air to identify pups and mates.

Did You Know?

Most seal species return to the very same stretch of coastline year after year to breed.

Behavior & Life Cycle

Seals give birth on land, typically to a single pup that develops quickly enough to swim within hours. Gestation runs 8–12 months depending on species, and most seals are polygamous — dominant bulls gather harems of 3 to 40 females. Seals can swim 15–18 mph and typically live 20–40 years or more, with sharks, orcas, and polar bears among their natural predators.

Conservation Status

Conservation status varies widely by species — some, like the Caribbean monk seal, have already gone extinct, while others such as the harbor seal remain abundant. Bycatch, hunting, and habitat disturbance are the leading threats across the group.