Dolphins and orcas have passed the evolutionary point of no return to ever live on land again
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Dolphins and orcas have passed the evolutionary point of no return to live on land again
https://www.livescience.com/animals/marine-mammals/dolphins-and-orcas-have-passed-the-evolutionary-point-of-no-return-to-live-on-land-again
Scientists have discovered that once a mammal has become fully aquatic, it passes a threshold that makes a return to terrestrial landscapes almost impossible.