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Why ancient deer returned to the sea and became whales
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Why ancient deer returned to the sea and became whales

Ambulocetus, an early whaleChristian Darkin / Science Photo Library By Colin Barras Animals first evolved to live exclusively on land about 370 million years ago – but on dozens of occasions since then land animals have gone back to exploiting the seas. That might be because the shallow seas around continents are so full of…