U. S. NATIONAL. MUSEUM 



BULLETIN 162 PLATE 27 



DRUMMING OF THE RUFFED GROUSE— CONTINUED 



Presented by Dr Arthur A. Allen. Frames 100 to 103 show the beginning of the terminal roll, where 

 the wings are blurred. Note the end of the roll, in frame 120, followed by a forward and downward 

 stroke, in frame 122, to help the bird regain its balance, as it pitches forward and the tail springs 

 upward in frames 122 and 123. Referred to on page 1 15. 



