wigeon, lesser scaup, gadwalls, blue-winged teal, cinnamon teal, 

 shove lers, and ruddy ducks. Canvasbacks and red-headed ducks 

 were also observed on some of the larger ponds. These species 

 utilized the open water not only for spring migration, but for 

 nesting and brood rearing as well. 



Canada Geese 



Marias River 



Tables 24 and 25 present data on breeding ground and produc- 

 tion surveys for Canada geese on the Marias River from Tiber Dam 

 to the mouth. These data have been collected by the Department 

 of Fish, Wildlife and Parks. For the 9-year period, the breeding 

 population has averaged 103.4 birds, using pairs and singles as 

 an index. Production averaged 95.3 young for the 4 years pre- 

 sented. Time constraints prevented a ground nest survey on this 

 reach of river, so data on nest success, nest production and 

 habitat use are not available. However, it is known that these 

 birds make similar use of islands for nesting sites and the gen- 

 eral factors, such as length of nesting season, etc., would be 

 the same as the Missouri River population. 



Average 



38.1 



27.2 



12.7 



116 



69 



