Whales are hiding a remarkable secret inside their flippers.
Why? Because whales didn’t always live in the ocean. Their ancestors walked on land millions of years ago. When they returned to the sea, evolution didn’t erase their arms it reshaped them. The bones stretched, the fingers lengthened, and layers of flesh formed powerful flippers.
Incredibly, whales swim using what is essentially a giant glove, concealing mammal hands beneath the waves.

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