Scientists say that the group once swam through the shallow coastal seas of Morocco.
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The distinctions between ancient and modern whales are astounding. While whales once lived on land, their modern marine descendants are now skilled swimmers, amazingly well-adapted to the seas. With such dramatic differences between their bodies and behaviors, it's no wonder that the transition between these two types of whales — ancient and modern — was a mysterious and prolonged process, taking place over several millions of years. And though scientists are still struggling to understand the transition as a whole, they're slowly and surely unraveling much of its mystery.
Ultimately, the bodies of these ancient whale ancestors began to adapt. Their front legs transformed into flippers, and their back legs shrunk in size. Their tails became bulkier to support their swimming, while their nostrils shifted higher and higher on their heads to assist breathing at the surface of the water. By around 35 million years ago, they'd become modern whales.
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