Hundred Acre Wood resident who sometimes falls into mouse holes while practicing jumping (3)

I believe the answer is:

roo

(Other definitions for roo that I've seen before include "Marsupial (abbrev.)" , "Hopper" , "Australian jumper" , "Kangaroo (Austr. colloq.)" , "Kanga's baby (Pooh)" .)

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

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