DENSITY PER HECTARE 

ul 
= 
= 0001 
o 
0.01 ae 
rtd 
LJ 
oO 
~ 
- 
Tr) 
z 
uw 
2 9.001 
0.002 
O- 300- 400- 500- 600- 760- , 
300 400 500 600 700° 800 0 100. 200. +300 
~ DISTANCE FROM BIRTHPLACE~ DISTANCE FROM BIRTHPLACE 
IN METERS IN MILES 
Figure 2 Figure 3 
Figure 2.--Density of Fledgling-banded Song Sparrows as Retrapped a 
Year Later on and Near a Study Area (after Nice 1937). 
In this and the next figure, the “curve” has been drawn 
in by visual inspection. 
Figure 3.--Density of Juvenile-banded American Robins Found Dead by 
the General Public in Some Subsequent Breeding Season 
(after Hickey 193). 
16 
