Number of Ducks 
Figure ] -- Phenology of Waterfowl Population 
District 8, 1949-1950 
5500 
5000 
4500 | 
4000 
3500 
3000 
2500 
2000 
1500 
1000 

15 30 15 30 15 30 15 30 
April May June July 
Date Censused 
