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Plate 2. A (Upper left). The drumming of the cock grouse is one of the 

 wonders of the bird world. The sound is made by striking the wings against air. 

 B (Upper right). Strutting before the female bird, the male stands stiffly with 

 tail raised and spread, wings drooping at the side, and the head drawn back into 

 its erected ruff. C (Lower). Young grouse in a brood dust bath. In addition to ex- 

 posed dirt, grouse often use well-decayed wood of old stumps for dusting areas. 

 Photos by A. A. Allen. 



