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The first whale species is believed to be Pakicetus, which lived around 50 million years ago during the Eocene epoch. Pakicetus was a land-dwelling mammal that resembled a wolf and had adaptations for an aquatic lifestyle, marking the transition from terrestrial to fully aquatic life in whales. Over millions of years, this early ancestor evolved into modern whales through a series of significant anatomical changes, including the development of streamlined bodies and specialized adaptations for swimming.

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