216 
Greenberg 
Table 1 : The context in which blue spiny lizards fed, foraged, or were aware of prey but made no move to 
feed. Based on 238 observations of a four lizard population in a large complex habitat. The ratio of daily time 
spent in basking versus perching is about 1:3, but the ratio of feeding episodes initiated during basking 
versus perching is about 1:5, and for foraging the ratio is about 1:10 
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DOMINANT MALE 
FEEDING 
6.5 
4.3 
19.6 
56.5 
13.1 
0 
(46) 
FORAGING 
6.2 
3.2 
26.0 
62.5 
3.1 
(32) 
AWARE OF PREY 
26.0 
0 
0 
75.0 
0 
0 
(4) 
SUBORDINATE MALE 
FEEDING 
16.7 
12.6 
0 
54.2 
16.7 
0 
(24) 
FORAGING 
0 
9.4 
3.1 
84.4 
3.1 
(32) 
AWARE OF PREY 
11.1 
11.1 
11.1 
55.6 
0 
11.1 
(9) 
FEMALE 
FEEDING 
9.6 
9.6 
9.5 
42.9 
28.6 
0 
(21) 
FORAGING 
0 
9.4 
3.1 
84.4 
3.1 
(14) 
AWARE OF PREY 
22.2 
0 
22.2 
55.6 
0 
0 
(9) 
FEMALE 
FEEDING 
0 
11.1 
6.5 
72.2 
11.1 
0 
(18) 
FORAGING 
8.3 
4.2 
16.7 
62.5 
8.3 
(24) 
AWARE OF PREY 
20.0 
40.0 
0 
40.0 
0 
0 
(5) 
CUMULATIVE 
FEEDING 
8.3 
8.3 
11.0 
55.9 
16.6 
0 
(109) 
FORAGING 
3.9 
4.9 
14.7 
71.6 
4.9 
(102) 
AWARE OF PREY 
14.8 
14.8 
11.1 
55.5 
0 
3.7 
(27) 
reveal in an ant-nest fashion the inner re- 
cesses of a saurian shelter (Fig. 11). 
The findings depicted in Figure 12 suggests 
that only the dominant male conforms to the 
often reported — almost classic — activity pro- 
file for diurnal lizards ; the subordinate male 
and female were more variable in their be- 
havior. It is also important to note that 
there were no overt agonistic social inter- 
actions that led to this pattern, and the en- 
vironmental temperatures never reached 
aversive levels. 
Lizards typically “slept” with their heads 
wedged tightly into the angles of the crevices 
(Greenberg, 1971). Animals were generally 
more alert on the wider parts of shelves. This 
apparent alertness seemed to follow a 
diurnal pattern suggesting a circadian varia- 
tion in thigmotaxic tendency (Fig. 13). 
250 WATT 
CLEAR INFRARED LAMP 
Figure 11. This habitat reveals in bee-hive fash 
ion the inner recesses of a shelter. Observations 
suggested important differences in the way dif- 
ferent members of the population utilized their 
space. 
