NUMBER OF BIRDS (THOUSANDS) 
90 
80 
70 Pacific Flyway 
60 
90 
40 
30 
20 
1949 1951 1953 1955 1957 1959 1961 1963 
YEAR 
FIGURE C-17.--Trend in numbers of wintering swan, 
Pacific Flyway, 1949-63. 
100 
