NORTH 
|O * * 4 
* 
ie ae 
5 * 
Ay %& 
* % 
* 
* KKK KE FH 
[Oa 20 [Ome cOssO Ss) ARS) ahs) 9 i) 2 lO , 20 ae 
FEB MAR APR MAY JUN 
10 4) 
CENTRAL 
EGG LAYING : 
lO 20 Om 2O moO sy) IEi fs) Sean 29 lo 20 30 
BIRDS COUNTED PER DAY 
6, 
FEB MAR APR MAY JUN 
Ke) 4. 
SOUTH % 
5, 
* 
5 * 2 
x“ * 
* z 
x ° 
* * Ans ae 
lO 20 (OiecOmo0 9 Ke? as) 9 [Sic lO 20 3am 
FEB MAR APR 
Fig. 18. — Egg-laying and migration seasons of the eastern phoebe in different areas of the state (see Fig. 1). Spring and fall graph 
(1967-1970) show highest daily counts of each 2 days (left scale). Asterisk symbols represent counts made in other years or by other observers. Sh 
areas show the percent of eggs laid on a given date (right scale). 
willow, black cherry (Prunus serotina), and apple were They also nest in towns and cities, but despite 
the most frequently used perching sites of phoebes in availability of numerous nesting sites in cities, ph 
northeastern Illinois. populations appear to be consistently very low in ul 
Phoebes appear to be very tolerant of humans, often areas. Barnes (1912) believed that the phoebe popula 
nesting on the porches of rural homes in forested areas. was declining, and attributed the decline, at least in f 
20 
