222 
Greenberg 
of higher neural structures and more specific 
external stimuli. They also illustrate the 
diversity and complexity of the behavioral 
patterns of lizards that make these animals 
such fascinating subjects for ethological in- 
vestigations. A researcher need only shed his 
preconceptions to appreciate the uniqueness 
of each species and its exquisitely tuned eco- 
evolutionary adaptations. 
ACKNOWLEDGMENTS 
This paper was prepared during a National In- 
stitute of Mental Health Grant Foundation Research 
Fellowship. Research involving the ethology and 
thermoregulation of Sceloporus cyanogenys was sup- 
ported by grant NSF GB-6827 to D. C. Wilhoft. I 
thank Drs. D. Crews, J. Eisenberg, T. A. Jenssen, 
P. D. MacLean, P. Regal, and E. E. Williams for 
their thoughtful comments on the manuscript. 
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