Dolphins and whales separately evolved the same speedy swimming bones

A 24-million-year-old fossil of a giant tusked dolphin lacks several features common to modern dolphins and baleen whales. The discovery shows that the common ancestor of dolphins and whales lacked these features, meaning the same adaptations for swimming must have evolved independently in both lineages.

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image credits: By PaleoGeekSquared – Own work, CC BY-SA 4.0,