"Shrieking” predators in "The Princess Bride” (4)

I believe the answer is:

eels

(Other definitions for eels that I've seen before include "Slender fishes" , "Fish (that may be jellied)" , "They swim" , "Sea creatures found in lees" , "Jellied --, traditional dish" .)

I've seen this clue in The Wall Street Journal.

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