4000n 



70n 



o 



UJ 



a. 



cr 



UJ 

 CD 



O-* r 1 1 1 1 1 1 1 1 1 «" 



JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 



Figure 37. Monthly changes in resident status composition of bird 



communities sampled by four roadside wildlife survey routes, 

 1977. R indicates yearlong residents; S, summer residents; 

 W, winter residents; and M, migrants. 



156 



