What is the thick insulating layer called in marine mammals like whales?

Blubber.

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Why: Marine mammals need a thick hypodermis, or blubber, for insulation.

Huh, didn't know that: Marine mammals need a thick hypodermis, or blubber, for insulation.

The dad joke
Blubber is a whale of a coat.
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References

Answer: Blubber. Marine mammals need a thick hypodermis, or blubber, for insulation.

  1. Mammal en.wikipedia.org/wiki/Mammal
    marine mammals require a thick hypodermis (blubber) for insulation
    Checked 2026-11-07.

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