RANGE ? 10 MARCH 18, 1947 TO FEBRUARY 9,1948 RANGE ? 7 MARCH 14 TO NOVEMBER 20, 1947 
(RECORD 23-24:450 TO 510 DAYS OF AGE) 
Figure 106. — Places of capture or observation of two of the introduced females. The numbers indicate the chronological 
order of the places observed. Each underlined number indicates that this position of observation is in a different locality 
(i.e. different alley or area) from the next observation. Female 7 was socially lower ranking, whereas female 10 was 
higher ranking. Sixty-eight percent of the observations for female 7 were in areas II and 111, but only the last two records 
for female 10 were here. This was at a time when she was a senescent nonaggressive individual. It is also interesting 
that 5 out of the 9 records when female 7 invaded the range of the dominant female 10 came at a time when she was 
pregnant and delivered a litter, even though she did not rear it. 
RANGE OF Cf 12 MARCH 22 TO OCTOBER 29 1947 
(CIRCA 214 TO 435 DAYS OF AGE) 
N AREA III AREA II E 
RANGE OF Cf 12 NOVEMBER 4. 1947 TO OCTOBER 28, 1948 
(CIRCA 441 TO 798 DAYS OF AGE) 
N AREA III AREA II E 
Figure 107. — Range of the introduced male 12. Note the shift of region of habitation accompanying different periods of 
life. During the earlier half of his life, when he was becoming the dominant rat of the pen, he was in the southeast quad- 
rant of the pen half the time. All later data indicated that this was the most favored quadrant of the pen. After he 
became senescent and reduced in social rank, he completely avoided this most favored region. 
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