The idea of a moat imparts a sense of impassibility and danger. For one to fall into the waters of a castle moat seems to spell inevitable death at the jaws of crocodiles, the pets of a sinister count or king, but is there any historical precedence for crocodile-filled moats?

This week on the Notcast, we look through the history books to find out how moats worked and if any contained killer reptiles.

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