Grey Seal

Overview

The grey seal (Halichoerus grypus) is a large, robust marine mammal belonging to the "true seal" family, Phocidae. Often referred to as the "horsehead seal" due to its distinctive profile, this species is widely distributed across the North Atlantic Ocean, with significant populations in the UK and Canada.

Distribution & habitat

Grey seals are found on both sides of the North Atlantic, including the Baltic Sea, the British Isles, and the eastern coast of North America. They are primarily coastal, utilizing remote islands, rocky shores, sandy beaches, and sea caves as "haul-out" areas to rest, socialize, and give birth. While they spend much of their time at sea, they are not considered migratory, though they may disperse widely after the breeding season.

Appearance

This species exhibits strong sexual dimorphism, with males growing significantly larger and heavier than females. Adults are characterized by a long, sloping muzzle—often described as a "Roman nose"—and nostrils that form a parallel W-pattern. Their coats range from grey to brown, typically featuring a unique pattern of darker blotches or spots. Pups are born with a distinctive, fluffy white coat known as lanugo, which they shed before entering the water.

Feeding

Grey seals are opportunistic predators that feed on a diverse array of marine life. Their diet consists primarily of various fish species, such as sand eels, cod, and hake, supplemented by crustaceans, squid, and octopuses. They are capable of foraging at various depths, often hunting in social groups to increase feeding efficiency.

Reproduction

Breeding typically occurs in autumn and winter, when seals congregate in colonies on land. Females are "capital breeders," relying on stored energy reserves during the nursing period. Pups remain on land for several weeks, rapidly gaining weight before they are weaned and begin their independent life at sea.