BVFFLE-HEAD DUCK— BUTTER BALL. 199 



with incredible speed, their wings cut the keen air, and 

 a whistling " Whew-u-u " is heard, attracting the hear- 

 er's attention. Being seldom molested, they become 

 quite tame and present to the hunter easy shots on 

 water, but more difficult when on the wing. Their 

 food consists of larvae, shells and seeds, and they 

 frequent wooded ponds and gravelly shores. 



