fotete ae DY BOON BU DI) Eel IN 13 
The affinity of the Woodpeckers locally for oak trees (of various species) 
is quite pronounced, as evidenced by the following percentages: 
Species Percentage Seen in Oaks (of all species) 
ee MPIC CC Ke er earn ote Ee ee (sete 
BveC De meumiyy DOC DECK aires tetra ee eee eee Sieh be ee aecsdhe sna 64.5% 
efein ie. VOR STaSeW Se) GN welt 2 Oe eae nes Sees ee en ee 43.6% 
UG oily 2 aaah AN aaa efe% eo ie ae Rl eg a a a 32.4% 
et ee Pet i nin Jon oe oh enna: 28.4% 
SCSULaT Eg a TET EPI GRSE WOK Vol fe ch ate eR Ry CER aa ee eo 13.8% 
Of those species having a smaller affinity for oaks, it is interesting to note 
that the Red-headed Woodpecker has an affinity for man-made perching 
sites (e.g., telephone poles); the Flicker has an unusual affinity for lawns, 
where it busies itself searching for ants; and the Yellow-bellied Sapsucker 
has an affinity for soft-barked trees, such as Cottonwood, Basswood, etce., in 
which it leaves straight rows of holes in the bark. 
The above observations were also recorded as to time of occurrence. The 
year is broken up into 24 quasi-equal divisions — each month being divided 
as follows — the ist of the month through the 15th being one division, and 
the 16th through the end of the month the second division, representing re- 
spectively the two subdivisions under each month’s heading in the table 
below: 
Jan. Keb. Mar. Apr. May Jun, Jul. Aug. Sep. Oct. Nov. Dee. Time 
0 0 0 27 30 14 26 23 38 8 1 0 1-15 
Flicker 0 0 a 36 22 DAT 32 35 19 yy 0 0 16-end 
Yellow- 
bellied 0 0 0 34 0 0 0 0 0 2 0 0 1-15 
Sapsucker 0 0 0 i 0 0 0 0 11 0 0 0 16-end 
Downy 4 1 if 11 20 2 iD 8 20 10 18} 1 1-15 
Woodpecker 2 3 Dail 20 6 9 9 i ike 8 ih wh 16-end 
Hairy 0 0 3 0 4 iL 2 0 il 0 0 0 1-15 
Woodpecker 1 0 $) 2 0 2 3 2 a 2 3 3 16-end 
Red-bellied if 2 3 0 0 1 0 0 4 2 3 0 1-15 
Woodpecker 0 0 3 0 0 0 0 1 0 4 4 3 16-end 
Red-headed 0 0 0 0 14 5 ab 2 0 il 0 0 1-15 
Woodpecker 0 0 2 6 9 14 9 A 1 0 0 0 16-end 
A casual glance at the above table indicates the relative stability of the 
Flicker and Red-headed Woodpecker as summer residents; the Downy, 
Hairy, and Red-bellied Woodpeckers as permanent residents; and the nearly 
absolute migratory status of the Yellow-bellied Sapsucker (all recorded 
spring observations in April and nearly all autumn observations in the 
last half of September). The high figures for March, April, and September 
in the case of the Downy Woodpecker may indicate a supplementary migra- 
tory population coming through from other geographical areas. 
The author is convinced that there are subtle migrations in spring and 
fall supplementing the resident populations of a number of our bird species, 
and he hopes to continue further research to substantiate this point. 
Box 31, Willow Springs, Illinois 
