Why Do Seals Bask in the Sun? Life Between Land and Sea

Seals lead a double life. In the water, they're sleek, graceful, and extraordinarily capable — diving to depths that would crush a human, holding their breath for over an hour, and navigating vast oceans with ease. On land, they're awkward, slow-moving, and seemingly helpless. Yet both worlds are essential to their survival. So why do seals haul themselves out of the water to bask in the sun? The answer reveals a lot about how these remarkable animals work.

Why Seals Bask

Seals are endothermic (warm-blooded) and maintain a constant body temperature. In cold water, they lose heat rapidly despite their blubber insulation. Basking on land allows seals to warm up, conserve energy, and rest without the constant effort of thermoregulation in cold water. It's also when they socialise, nurse their pups, and moult (shed their old fur coat for a new one).

Built for the Deep

Seals are extraordinary divers. The Weddell seal holds the record for the deepest dive by a seal — over 600 metres — and can hold its breath for over 80 minutes. How do they do it?

Seals have a much higher concentration of myoglobin (an oxygen-storing protein) in their muscles than land mammals, giving their muscles a dark, almost black colour.
When diving, their heart rate drops dramatically — from around 100 beats per minute to as few as 4–6 beats per minute — conserving oxygen for the brain and heart.
Blood is redirected away from non-essential organs to the brain, heart, and muscles.
Their spleens act as a reservoir of oxygen-rich red blood cells, releasing them into the bloodstream when diving.

True Seals vs. Sea Lions

Kids often confuse seals and sea lions. The key differences:

Ears: True seals have no external ear flaps; sea lions have small, visible ears.
Movement on land: True seals wriggle on their bellies; sea lions can walk on all four flippers.
Flippers: True seals use their hind flippers for swimming; sea lions use their front flippers.

Fascinating Seal Facts

There are 33 species of seal worldwide, from the tiny ringed seal to the enormous elephant seal.
Male elephant seals can weigh up to 2,700 kg — the largest of all seals.
Australian fur seals are found along the southern coast of Australia and are the most common seal in Australian waters.
Seals communicate through barks, growls, and grunts on land, and through clicks and whistles underwater.
A baby seal is called a pup and is born with a white fluffy coat that it sheds after a few weeks.

Seal Activities for Kids

Blubber experiment: Fill a bag with vegetable shortening and submerge your hand in iced water. Compare to the other hand without insulation. Discuss how blubber keeps seals warm.
Breath-holding: Time how long you can hold your breath. Compare to a Weddell seal's 80 minutes!
Seal vs. sea lion: Look up images of both and identify the key differences. Can you tell them apart?
Dive physiology: Draw a diagram showing how a seal's body changes when it dives — heart rate, blood flow, and oxygen storage.

Dive Into Ocean Play

Our wooden seal figurine is part of the Coral Bay collection — beautifully crafted from sustainably sourced timber, celebrating the wonders of the ocean.

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