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Have we ever discovered completely aquatic dinosaurs?

Best Answers

Nope! All known dinosaurs are at least partially terrestrial. Most don't seem to have much of any aquatic adaptations. read more

There are a handful of dinosaur groups that are semi-aquatic: Spinosaurus was semi-aquatic, as you pointed out, and some of its relatives may have been as well; Hesperornis and its relatives were a very specialized group of ancient birds, which may have spent most of their time in water; similarly, more familiar examples of semi-aquatic dinosaurs include ducks, geese, diving birds, penguins, and plenty more. read more

Thanks for the thorough answer. Interesting to learn that there are no non-avian, fully aquatic dinosaurs yet discovered in the fossil record. I wonder why it didn't seem to happen. Also, since you seem to be knowledgeable about such things, maybe you can answer a related question. read more

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