Vol. 20, No. 11 
Page 2 
Ecology and Management of Squirrels 
C. M. Nixon, 
L. P. Hansen 
fox s l'ii^!j a f t / eS ! arCh .' e i ter < 20 <9)--3) "e pointed out that adult female 
the most weigh^er^ CT'^ ^ 
weight on mockernut hickory nuts (k 1 o/dav I cLnL rV l • Y ? a1ned 
irsrr»"•>)■ ;'-4 
corns per day, 10 h.ckory nuts per day, and 20 black oak acorns per day. 
In terms of tree abundance, white and black oaks and the hickories are 
the most common squirrel food species in Illinois. As of 1962 the ast 
eight b^aclToaks 'ind"?'^ h^i^ ° n the avera 9 e > n '"e white oaks, 
upland o^est types in Hindis ?hi ar96 h r “"J 9 i? in ° heS dbh per acre in 
about 46 pounds £ sound lead er Icre " Wh ' te ° ak trees would Produce 
for about 550 days. Of course many other en ° U9 t0 feed ° ne f ° X s 9 uirr «' 
consume more of ^he annual trte seed cJoo than do'fn aC ° rns , and P robab, V 
of f-hys . ce 5eea crop than do fox sguirrels How murh 
,h, mH . nnu ! cr ° p IS eaten b v squirrels is unknown, but, considering the 
we doubt\hat s L ::;;tdX: ice ' and chipmunks - 
— P ° n5eS ' — - C ^ kens *2 Habitat Ma nipulation R. L . Westemeier, 
D. R. Vance 
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a 0 nd a ( 2 ) CCeSS l U, . Wndlife * * “Sra ttaTrul^Kt r o? n S«5 U C 1) ies 
and (2) populat.ons distributed as uniformlv as nnscihio o K J 9 dens,t,es 
Use of this concent is Kpr™; uniformly as possible over given acreages. 
program for prairie chicken- 'a* n'nnn ap , propr 1 ate for evaluating the management 
stabilized a? V00] aero n " SCause , the sanctuary acreage has 
on or within 0.5 mile of thp s ' h& numh f r ° r cocl<s on booming grounds 
square miles provides the bar. i sfo/th i sZZ luat i ^ SCattered over 8 contiguous 
acreage'? iET&mTwE 23 P6rCent ° f the «"«t«ary 
population and (2)the approximate'ce°r 9 TT’ ^ ° f the prairie chicken 
Between 1963 and 1972 thi- 2^2 en ^ ° tlG s ° nctU3r y system at Bogota, 
cock population and 37 tSW i r 7 1 C , reported 54 to 75 percent of the 
flock a? Bogota since Ml ZZ ZZ ° bSerVed h ° n popala ti°n in the 
maintained 4 5 to ZrclZZZZ\ Veatter-Field-McGraw unit has 
the observed hen iZlZZ "ft. 
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