50 WARM-WEATHER DIVERS. 
longer time, giving way to the third issue, which 
breeds in the United States and southern Canadian 
border. 
During the fall migration the first issue is from the 
birds raised from the third spring issue, and they are 
not yet full feathered. They travel slowly down to the 
frost line and are overtaken by the second issue, which 
arrives when the first real cold snap occurs in the ex- 
treme north. The third issue rushes down as the 
winterly storms reach them in the United States, stay- 
ing as long as any open water is to be found; remain- 
ing for several weeks in the south lakes of Illinois, 
Missouri and on the Mississippi borders. 
Their feeding grounds are upon still lakes, ponds, 
sloughs and musquaids, bayous, inlets and bays of the 
seacoast and large rivers. Their playgrounds are ir 
open water or open places in lilies, lotus, etc., large 
ponds, lakes and rivers; sometimes on sandbars on 
rivers, where they pack together and float upon the 
surface during the middle of the day, basking in the 
sun. Hence they obtain the name of raft ducks, or 
flocking fowl; even in rough weather they may be 
observed floating over the choppy waves on our nu- 
merous lakes. Their roosting grounds are in open 
water holes surrounded by various aquatic plants, on 
the bushy shores of lakes, bays, bayous, etc. Their 
nesting grounds are in flags, canes, rushes, heavy 
grass, bunches of willows, buck-brush and wild rice. 
Their call is a pu-r-r pu-r-r, with the accent on the p 
continued on the r. 
For food, see chart. 
They are both prairie and timber birds, liking wide 
