Perhaps dolphins are descendants of an ancient civilization, they evolved from land animals https://www.whalefacts.org/dolphin-adaptations/ https://www.whalefac

Perhaps dolphins are descendants of an ancient civilization, they evolved from land animals https://www.whalefacts.org/dolphin-adaptations/ https://www.whalefacts.org/dolphin-adaptations/ about 50 million years ago. Just imagining here, but what if they had an industrialized civilization that caused global warming that led to the PETM temperature rise, their civilization declined and they had to adapt to a water world. Chuckle, just a kooky thought I had after reading that article.