Tabla & 

Total 
Heats Nesta Percent Arerage 
Found Followeq Destroyed Deptroyed No. of Bega 
Mallard ol a? a5 93 &.86 
Gadwall 4 z 1 50 10,00 
Fintail **" 6 6 1 20) 7.00 
Blue-winged teal 26 265 20s id 9.66 
Shoreler 3 3 Z 169 11.09 
Redhead 7 7 7 100 9,00 
Learer scaimp 1 0 _ - 2.00 
Ruddy duck 7 4 2 BO 6.75 
411 species a? 74 £5 79 - 
use of Ne rugti 
HaMigie) g* Crow, Drowmed Flowed Deserted Unimown 
Mallard 16 4, - - z a 
Gadwall - 1 - - ~ - 
FPinteil *** 1 ~ - - - - 
Blue-winged teal 14 es 1 1 ~ e 
Shoveler 1 1 CA ye r= - - 
Hechead - 1 3 — a x 
Leaner acaup - - - - ~ - 
Ruddy duck - - - - 1 1 
All species ue 9 4 a 4 8 
* Cf the 32 deatroyed by mammals, 27 were by skunk, 3 by badger, 
1 by fox. 
Destroyed by road construction rachinery. 
ev All pintall neets found were re-nesting attempts, or at leaat 
Fery late. 
+7 
The above deta are not sufficient evidence upon which ta base any 
conclusions. 
Brood Survival Tate 
Herth Dakota 
Thirty-eight quarter-section sample areas were laid out in North 
Dakota end were completely censused three separmmte tires as follows: 
May 20 to June .3; June 14 to 21) aod July 18 to 24. Except for the early 
nesters, (pintail, mallard, and canvasback) only PAirse and lone drakes from 
the June 14 to 21 census were considered to be breeding pairs when estimating 
brood potentials for each ares. Teble 6 12 & summary for 411 3B area. 
From data shown in Table & the most successful neaters appear to be 
canvantack, ruddy duck, blue-wlozed teal, redhead, pintall and gadwall in that 
order. <A later check made in duguet would have produced 4 few nore gadwall 
broode showing thia species to be somewhat more succeseful. An effort wae 
LA9 
