It is said to be difficult to raise mallard decoys in the southern bottoms; 
that they have to be taken to the uplands to breed successfully. 
Whether this is true, and whether, if true, it respresents an in- 
herent environmental condition not susceptible of control, or merely some 
natural enemy like turtles, is an unanswered question meriting real re- 
search. 
At Meredosia Lashbrook says there are practically no breeding ducks 
except wood ducks, of which perhaps 1,000 raise yearly on Meredosia 
Island. On the other hand Hamilton reports an appreciable increase of 
breeding mallards in 1928, 
Luthy estimates perhaps 100 mallards and 200 wod ducks raised on 
Duck Island in 1928, 
Musselman estimates Lima Lake raised 5,000 mallards and 500 wod 
ducks in 1928, 
Roshen says there was a large hatching of mallards in 1928 from 
Beardstown to above Havanna in the flooded cornfields behind broken levees. 
Eldredge says Grass Lake in Lake County raises many mallards and 
teal, 
Crystal Lake Club in Henderson County raises many wood ducks but 
practically no mallards, 
If there is no immovable obstacle to mallards breeding in Illinois, 
then it should be possible for. clubs and farmers to raise large local 
stocks by letting pinioned birds raise young to join the flight. This is 
the method being tested by Cox at Winona, Minnesota. 
Rest Grounds. The concentration of ducks into limited areas is a matter 

of spilled milk, too late to lament. The abuses growing out of that 
concentration are not all subject to affective control, There is one 
effective offset to those abuses, however, which is easy to control and 
which is 
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