BUFFLE-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 larve, shells and seeds, and they 
frequent wooded ponds and gravelly shores. 
