"How fast does a ___ have to run before it looks gray?": Demetri Martin (5)

I believe the answer is:

zebra

(Other definitions for zebra that I've seen before include "that's stripy" , "Striped quadruped" , "Fleet striped African equine" , "African beast" , "Black and white striped animal" .)

I've seen this clue in The New York Times.

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