Animals, which, as Flanders and Swann tell us, ain't elks? (4)

I believe the answer is:

gnus

(Other definitions for gnus that I've seen before include "Gun (anag.)" , "African runners" , "Big game" , "Snug (anag) -- wildebeest" , "South African antelopes" .)

I've seen this clue in The Guardian.

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