{except for o vary small Redhsed population on Lake St. Clair} and the result 
is thet great tracts of marsh are not producing any duoks at all. 
‘There ia a largs influx of black duck end mallard which sterst sbout 
the middls of June and tontiguss until the ducks moys south for ths winter, 
Host ef the adult ducks counted in July and August bslong to this nomed popule- 
tion, This influx is particularly marked in the marshes with controlisd water- 
letela, 
‘Whers thsae ducks come from is not ¢syrtain. No doubt many tried to bresd 
on ths ponda and pot-holss inland." 
&3 

