It was sacred to Thoth (4)

I believe the answer is:

ibis

(Other definitions for ibis that I've seen before include "sacred creature of Egypt" , "Wading bird with a down-curved bill" , "One has large bill" , "Bird, sacred to ancient Egyptians" , "Wader with a long down-curved bill" .)

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

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