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Dolphins Have Hidden Fingers. So Do Seals. These Sea Creatures Did Not. – The New York Times

A recent analysis of the flippers of living and extinct marine animals shows the enduring power of “baby mittens.”

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Other than penguins (whose ancestors evolved wings before they returned to the water), all of the living aquatic animals in the study pursued this strategy, Dr. Vlachos said. Some now-extinct creatures, such as plesiosaurs and ancient crocodiles, had fingers in their flippers as well.
The exception was ichthyosaurs thick-bodied reptiles that ruled the seas through the early Jurassic.Their ancestors also had fingers.Butover time, they connected to each other until they were less like a multibran…

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