€L 
NUMBER OF BIRDS (THOUSANDS) 
90 
80 
10 
1949 
Pacific Flyway 
1951 

1953 
90 
80 
a 
= 70 
= 
oO 
= 
«80 
[om 
co 
co 
i 30 
ce 
Lid 
ca 
= 4 
= 
30 
0 Atlantic Flyway 
1955 1957 1959 ~=s_-:196 1 1949 1951 1953. =: 1955 
YEAR YEAR 
FIGURE C-4.--Trend in numbers of wintering swan, by Flyways, 1949-61. 
1957 
1959 
1961 
