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Skeleton of Ambulocetus natans, an ancestor of modern whales that lived during the Eocene Epoch, a part of the Tertiary Period.

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Skeleton of Ambulocetus natans, an ancestor of modern whales that lived during the Eocene Epoch, a part of the Tertiary Period.
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Skeleton of Ambulocetus natans, an ancestor of modern whales that lived during the Eocene Epoch, a part of the Tertiary Period. By Momotarou2012 – Own work, via Wikimedia Commons

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