Hooded Seal

Fascinating facts about the Hooded Seal

• A hooded seal pup gains 7 kilograms per day during its four-day nursing period — the shortest lactation of any mammal on Earth. The mother's milk is nearly 50% fat (compare: human milk at 4%), allowing her to pack a year's worth of growth into 96 hours before she abandons the pup to fend for itself in the Arctic ice. This explosive feeding strategy means she never leaves her pup unattended, not even for a drink.
• Only male hooded seals possess the hood — a inflatable pouch of skin and muscle that expands across the nose and forehead like a balloon. When threatened or competing for mates, a male can blow his hood to nearly double his head's apparent size, and he can even push one nostril through the membrane to create a bright red balloon that dangles from his face. This red balloon is essentially a warning label that says: I am bigger and more dangerous than you think.
• Hooded seals spend roughly 80% of their lives in open ocean, diving to depths of 1,000 metres to hunt fish and squid in near-total darkness. Their eyes are enormous relative to their head size — built for the twilight world where sunlight barely penetrates — and their blood contains three times more oxygen-carrying hemoglobin than a human's, allowing dives lasting up to 30 minutes without a breath.
• In just four weeks, a hooded seal pup transforms from a newborn to a fully independent ocean hunter, learning to dive and forage without any parental instruction or social learning. No teacher shows them where the fish are; no mother guides their first deep dive. This extreme independence mirrors their solitary adult lives — hooded seals are among the least social seals, often found alone on the ice or scattered across open water with no bonds beyond breeding season.
• The North Atlantic hooded seal population has crashed by over 70% since the 1950s, driven primarily by hunting and entanglement in fishing nets. What once numbered over 600,000 seals now sits below 150,000, making them vulnerable to extinction within decades. Their short breeding window — just four days per year when mothers nurse — means the population cannot bounce back quickly if too many pups or adults die in a single season.

At a glance

About the Hooded Seal

In the dark, icy waters of the North Atlantic, the hooded seal glides with effortless elegance, its sleek, gray form undulating as it propels itself through the currents with powerful flips of its flippers. As it breaks the surface, its distinctive "hood" - a fleshy, inflatable sac on its forehead - is a striking sight, a vibrant splash of color in the monochrome landscape of sea and ice. With each emergence, the seal's large, dark eyes seem to hold a deep wisdom, a testament to its remarkable adaptability in a rapidly changing world.

Discover more wildlife