arate AsUni- Ur BRO Ne Bolle ke tT TN 23 
were 524 adults, 118 immatures, and 50 not aged, for a percentage of 81.6 
to 18.4. Other comparisons — reported in previous issues of the AUDUBON 
BULLETIN — have not shown such close correlation. 
2309 Fifth Avenue, Moline, Illinois 
AGES OF CHICKADEES IN COOK COUNTY 
By Karl E. Bartel 
In 1953 I started to band winter birds in the Cook County Forest Preserves. 
At first I ran three stations that were half-way between Tinley Park, Il- 
nois and Palos Park, Illinois. By 1962 I had expanded my stations in this 
area to five. Also in 1953 I had two other stations operating, one at Maple 
Lake, south of Willow Springs, Illinois, and one just west of Palos Park, 
Illinois. By 1957 I had also expanded this area to five stations. I now operate 
10 winter banding stations, five at a time on alternate week ends. 
Table #1 gives the total of Black-capped Chickadees banded for each 
year from 1953 through 1965. Table #1 also lists the returns for each year 
of banding, showing birds captured one or more years later. The last column 
of Table #1 gives the percentage of chickadees that survived at least one 
year. 
TABLE #1 
Individuals Returning Percentage 
One or More Surviving 
Year Banded Years Later One Full Year 
1953 36 10 27.8% 
1954 52 11 21.29% 
1955 66 16 24.2% 
1956 43 5 11.6% 
1957 57 14 24.5% 
1958 89 Pash 30.4% 
1959 97 22 Deel OYE 
1960 78 6 (ene 
1961* 25 , 1 4.0% 
1962* 53 29 54.6 % 
1963 jbl 39 35.1% 
1964 94 26 Dial ve 
1965 141 Dal 19.1% 
TOTALS: 13 Yrs. 941 | 233 24.7 % 
*“NOTE: The low numbers for banded and returns in 1961-1962 are due to 
my not being able to band from November 1961 through March 1962. Peter 
Dring did operate one of my stations, and thus at least a few birds were 
banded. 
Table #2 lists all of the Black-capped Chickadees that returned to the 
stations from January 1, 1965 through December 31, 1965. There were 63 
returning birds. Also, there were 141 new chickadees banded in 1965. 
Thus, there were at least 204 chickadees in these areas wearing bird bands. 
