Yes That's totally true. No human ever saw a dinosaur (except their bird descendents but that's a different matter). However something us and the rest of the mammals presumably descended from was around the same time and would have probably interacted with them on some level, either running away or snatching eggs.
Could reactions to certain forms be written into us? A chimp who's never seen a snake will react with great caution to an even inanimate snake-like object and probably most mammals feel something similar. Do they all dream of dragons too?
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Aw....Snicket
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