Sometimes Genius, Sometimes Fool

The Walrus

I wonder how a walrus can swim without musing about an unusual blubber placement/ratio for a clumsy iceberg creature. Never knew about the tusks…

Yes, walruses are excellent swimmers and spend about two-thirds of their lives in the water, despite appearing clumsy on land. Their body type is uniquely adapted for both buoyancy and propulsion in Arctic waters, featuring a thick layer of blubber (up to 15 cm) and a streamlined, spindle-shaped body.

Why Their Body Type and Buoyancy Are Specialized:
* High Buoyancy: Their thick blubber layer provides high positive buoyancy, which allows them to float easily but requires them to use active propulsion to stay submerged while diving.
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* Odd Sleeping Adaptation: To rest at the surface without sinking or using energy, they have pharyngeal pouches (air sacs in the neck) that can hold up to 50 liters of air. This lets them float vertically in the water to sleep and even stay submerged.
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* Unique Propulsion: While they can move all four flippers, walruses typically use their rear flippers for speed and front flippers for maneuvering. They often use a "sinuous" whole-body movement, rather than just flipper-driven motion.
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* Adaptable Body: Their tusks are actually canine teeth used for pulling themselves onto ice, and they can even slow their heart rate during deep dives.
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While they may look clumsy on land, their buoyant, blubbery bodies become fast and agile underwater, allowing them to swim gracefully and even achieve speeds of up to 35 km per hour.

Seaworld.org

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