358 



Roosevelt Wild Life Bulletin 



Fig. 97. The whirring of the " muffled drum." The picture is from an ex- 

 posure of about 7 seconds, covering half of a drumming performance, begin- 

 ning with the first wina-beat. 



Fig. 98. A snapshot made between wing-beats early in the drumming. The 

 wings hang limp for an instant before the next upward stroke. 



