Mammal bested by a reptile in a fable (4)

I believe the answer is:

hare

(Other definitions for hare that I've seen before include "As mad as this March animal" , "Sect: -- Krishna" , "Animal like large rabbit - let it sit" , "Mammal - run fast" , "Old saying: 'Let the .... sit" .)

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

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