Weighty birds (4)
I believe the answer is:
emus
(Other definitions for emus that I've seen before include "Muse about flightless Australian birds" , "Running birds" , "Large flightless birds of Australia" , "laboratory units" , "Aussie birds" .)
I believe the answer is:
emus
(Other definitions for emus that I've seen before include "Muse about flightless Australian birds" , "Running birds" , "Large flightless birds of Australia" , "laboratory units" , "Aussie birds" .)