Seals were aquatic mammals that inhabited coastal waters, islands, and temperate seas. They had streamlined bodies covered in short, dense fur, and thick layers of blubber that kept them warm in cold waters. Adult seals ranged from 1–2.5 m (3–8 ft) in length and weighed 50–300 kg (110–660 lb), depending on species. Their limbs were modified into flippers, allowing them to swim with grace and power, though on land they moved with awkward, rolling motions.
Seals were carnivorous, feeding on fish and other small aquatic animals. They hunted in water but came ashore or onto rocks to rest, molt, and give birth. Mothers nursed pups on land, providing rich milk that encouraged rapid growth before the young returned to the sea. Seals were generally social animals, forming small colonies or aggregations in suitable coastal areas.
While not aggressive by nature, they could defend themselves with sharp teeth and strong bodies when threatened by predators. They were known for their distinctive calls, which carried across water and ice, serving to communicate between mothers and pups or among members of a group. Many coastal Mortalkind regarded seals with fascination, valuing their fur, fat, and meat, and telling tales of their cleverness and elusive habits.