Birds with wings about one-tenth the length of their bodies (4)

I believe the answer is:

emus

(Other definitions for emus that I've seen before include "Largest native Australian birds" , "Muse about flightless Australian birds" , "Fast, but not high-fliers" , "Running birds" , "Large flightless birds of Australia" .)

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

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