Percent of Brood Appearing 
30 
25 
20 
15 
1c 
on 

All Species, 531 Broods 
Pintail, 178 Broods 
Mallard, 134 Broods 
Blue-winged Teal, 89 Broods 
Shoveler, 61 8 roods 
May May May May 29 June June June dume 26 July July July duly July 31 Auge 
8-14 15-21 22-28 June 4 5-11 12-18 19*26 July 2 3-9 16-16 17-23 2430 Aus. 6 7-13 
Figure 4. Hatching Peaks for Mallard, Pintails, Blue -winged Teal, Shoveler, 
and All Species Combined on the Success Study Area, 1955. 

