Demographic Analysis 
233 
Table 2. Distribution of hatchling spiny lizards in three crowding tolerance experiments 
conducted in enclosures near Manhattan, Kansas. 
Enclosure 
# of Minutes 
Behavior 
Observed 
# of Hatchlings 
Per Tub 
( # males/ 
# females) 
Feeding 
Schedule 
SNS* 
Date 
Lizards 
Introduced 
Date 
Experiment 
Terminated 
Experiment 1 — late clutch hatchlings: 
A 315 7 (4/3) 
7 SNS 1-3 
9/1/71 
10/19/71 
B 
90 
7 (2/5) 
times/week 
// 
8/17, 18/70 
10/10/70 
C 
105 
6 (2/4) 
// 
8/13-15, 17/70 
10/10/70 
D 
45 
9 (4/5) 
ff 
8/15, 17, 29-70 
10/10/70 
E 
135 
7 (2/5) 
/r 
8/8, 9, 14, 17/70 
10/10/70 
F 
240 
1 (1/0) 
1 SNS 1-3 
8/31/71 
10/19/71 
G 
60 
1 (0/1) 
times/week 
// 
9/ 1/71 
10/10/71 
H 
75 
1 (1/0) 
// 
8/13/70 
10/10/70 
I 
75 
1 (1/0) 
/r 
8/ 9/70 
10/10/70 
J 
90 
1 (1/0) 
8/11/70 
10/10/70 
K 
90 
1 (1/0) 
8/13/70 
10/10/70 
L 
90 
1 (1/0) 
n 
8/14/70 
10/10/70 
Experiment 2 — early clutch hatchlings : 
A 0 10 (2/8) 
10 SNS 2 
7/29; 
9/ 7/72 
B 
0 
7 (3/4) 
times/week 
7 SNS 2 
8/1-2/72 
7/29-8/2/72 
// 
C 
0 
5 (2/3) 
times /week 
5 SNS 2 
7/29-30/72 
// 
D 
0 
5 (1/4) 
times/week 
5 SNS 2 
7/30-8/2/72 
E 
0 
1 (1/0) 
times/week 
1 SNS 2 
7/24/72 
F 
0 
1 (0/1) 
times/week 
// 
7/29/72 
G 
0 
1 (0/1) 
// 
7/29/72 
H 
0 
1 (1/0) 
// 
7/29/72 
n 
I 
0 
1 (0/1) 
// 
7/29/72 
// 
J 
0 
1 (0/1) 
ff 
7/29/72 
// 
K 
0 
1 (0/1) 
ff 
7/30/72 
// 
L 
0 
1 (0/1) 
// 
7/24/72 
ff 
M 
0 
1 (0/1) 
// 
7/29/72 
// 
* SNS — Standard Net Sweeps (see text). 
flee, hide, or assume a submissive posture 
(Carpenter, 1967). 
There seemed to be a correlation between 
the intensity of the interaction and the 
similarity of size of the interacting lizards 
(Table 3). Thus, the most vigorous inter- 
action which included several chases and 
several attacks was between the two com- 
batant lizards most similar in size. The four 
most vigorous interactions, which included 
at least two chases and resulted in the sub- 
ordinate being chased from the view of the 
