Did you know that the ancient Greeks and Romans didn't have a word for sharks--despite the fact that they must have seen them eating sailors during sea battles all the time? For that matter, they didn't have a word for "whale" either. But they did describe the most fantastical sea creatures, including Nereids, Ketos, and "sea dogs." Whatever those were.

Just what were the ancients seeing in the sea, anyway? In this episode, ancient sea monster expert Ryan Denson helps us unpack it all.

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