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The thick layer of fat under a marine animal's skin is called blubber, and it keeps the animal warm, much like insulation in a house.
It is called tallow.
mammoths
The thick layer of fat under a marine animal's skin is called blubber, and it keeps the animal warm, much like insulation in a house.
Armadillos and turtles have thick shells.
A hyena has a lovely thick kneck, as does a rhino.
basically any bird has thick feathers.
Beavers and polar bears have thick fur.
Thick glues are called 'gel' glues.
Penguins
You mean Pachyderm, it is a thick skinned animal such as an elephant or hippopotamus
Saprophytes have thick walls called endspores?