ottained by two men beating elowly around opposite sides of the potholes. 
During the periad when many of the colored broods were hatching, the area 
of search was extended one-half mile on all sides bringing the total up te 
five aquare miles. In addition, searches were made along the roads up to 
two miles away. 
Findings 
Brood Yovementna 
The following tables indlcete the number of clutches colored and the 
neverents of marked broods. 

Sneacies Clutches Marked Clutches Hatched Broods Located 
Baldpate = 1 1 
Blue-winged teal 4 z 0 
Can vaeback 3 2 z 
Gadwall 1 1 0 
Green-winged teal 1 1 0 
Mallard 3 1 1 
Pintail 1 1 1 
Redhead 4 2 sf 
shovel er 1 1 G 
Total mM) 12 6 
* One-day-old duckling found dead 75 yards from nest. 
Movements while marked Subsequent movements 
Minimum Minimum Duration Minimum Mininom Duration 
overland no. of of overland no. of of 
travel potholes markings travel potholea obeerva- 
Species used used tion 
Baldpate 2 miles 1 eo dare none -- ed days 
Canvashack .43 milee 2 a2 days none -- i days * 
Canvagback .2)] miles 5 32 daye none -- 21 days 
Fintail 42 milee 1 16'daye unknowh  - - 0 
Redhead 44 miles 2 20 dare -3 miles 2 os days 
* Wag not recognized during 4% daye additional fieldwork. 
' Seen only once (color still bright after 16 days). 
Only nests of unquestionable fate are listed as hatched, Movements 
shown are the minimum distances the birde had to walk between potholes on 
which they were seen, There may have been other movements which were not 
observed. No broods were seen during their overland travels, so it is not 
poeelble to determine whether or not they took the shortest route between 
potholes, or whether they swam acrorsa or walked around intervening water. 
In four cases, since there was slight poselbility of confusion with other 
broods, it was Possible to follow the broods after the color had faded, 
Date on movements of unmarked treods were obtained during the couree 
of the study. All species listed below were found to move from pothole ta 
yothole. 4 tentative rating of relative mobllity 1s shown. 
72 
