
GADWALL 






3 ALLARD 
fy Sie 
ole bis 
MAULAROT™ 
itp 
oi 
Wt 
BW TEAL 

4 Ys 
CANVASBACK 

BROODS WHICH WERE NEVER SEEN 
o—____—> 
NEST SUBSEQUENT OBSERVATION @—>) 
. EXCEPT ON POTHOLE BY NEST 
Figure 21.--MOVEMENTS OF 18 MARKED BROODS ON WAUBAY STUDY AREA 
seen to leave their young for periods of an hour or more, make flights around 
the area and return. These movements were not always from poor to perceptibly 
better potholes, but were never to areas obviously poorer than those last 
occupied. 
Different species vary in their ability and willingness to move overland. 
Table 14, (adapted from Evans et al. 1952), shows the relative mobility of 
broods of the seven species most commonly found in the pothole country at 
Minnedosa, Manitoba. These data indicate that the pintail, canvasback, and 
mallard are by far the most mobile, and travel overland many times more often 
M7 
