Answer to the joke, "What did the buffalo say when his boy left for college?" (5)

I believe the answer is:

bison

(Other definitions for bison that I've seen before include "Large humped bovid of N America" , "US prairie cattle" , "US wild ox" , "Kind of shaggy cattle" , "O bins could be full of buffalo" .)

I've seen this clue in the Universal.

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