ROLE OF PREDATION 



313 



(.KOUSt; IXU SHLLLS KOUND IN VICINITY OF I3R0KEN-LP .NEST (,I\ INC EVIDENCE OF HAVING BEEN 

 EATEN BY A FOX. SHELLS WERE ACTUALLY LEFT MUCH MORE WIDELY SCATTERED THAN SHOWN 



IN PHOTO 



SHE Ol- HKOkKN-l 1> (,K()ISE NEST SHO\MN(, FEATHKKS l)F FEMALE WHICH WAS PROBABLY KILLED 

 BY A GREAT HORNED OWL AND SEVERAL EGG SHELLS GIVING EVIDENCE OF HAVING BEEN EATEN BY 



A RACCOON 



But, while the degree of loss over a region as a whole may average very nearly the same 

 for successive years, local areas often vary more widely. The record for Connecticut Hill is 

 an example (figure 24). During most seasons the number of such local areas above average 

 tends to balance those below. Now and then, however, as in 1940, a majority lean the same 

 way. 



