II »v YOUNG OF ? 43 -POST WEANING CAPTURES 
(LITTERS 8, 13, 8 18) ~ (AFTER 60 DAYS OF AGE) 
I AREA IV AREA I S 
8 ?? YOUNG OF ? 43- POST WEANING CAPTURES 
(LITTERS 8, 13, 8 18) - (AFTER 60 DAYS OF AGE) 
N AREA III AREA II E 
Figure 111. — Points of capture of the young of female 43. The points circled indicate terminal records. Note that there 
was absolutely no invasion of area I, which was on the opposite side of the pen from which these rats were born. All 
the females but 55 survived to May 17, 1949. Only males 54, 56, 59, 660, and 662 survived this long. The interest- 
ing thing about the terminal records of these longer surviving rats was that all were forced from their place of birth into 
area IV or the North Alley, to become members of colonies g, j, and k (see pages 385-390). These rats were born in 
what at the time was the least desirable portion of the pen, and they were later displaced into other localities which 
had become even less desirable by the time they became adults. 
16 oVBORN IN AREA I DURING 1948 
••POST WEANING RECORDS 
N AREA III • “TERMINAL RECORD AREA II E 
8 99 BORN IN AREA I DURING 1948 
• • POST WEANING RECORDS 
Figure 112. — The poinrs of capture of rats born in area I during 1948. Arrows point to terminal captures. Note how the 
females tended to remain near their place of birth, whereas the males became distributed more widely through the pen. 
166 
