Wednesday, 27 March 2019

evolution - Has any flying creature evolved into a sea creature?


I am talking about a creature that has evolved true flight. Has any such creature evolved into a sea creature, that permanently dwells on water (like fully aquatic fish) and doesn't come out? According to the theory of evolution, many sea creatures of the deep past evolved into land animals and some of them went a step further, evolving flight. I am talking about the reverse process, excluding semi-aquatic or semi-terrestrial animals.





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