5 desert iguanas (Dipsosaurus dorsalis) were given avoidance training on a modified Mowrer-Miller one-way shuttle-box using shock as US and a compound light and buzzer CS. All lizards reached avoidance criterion with a mean of 140 trials. Several procedural factors may account for these results which are in marked contrast to previous reports of failure of lizards in avoidance acquisition. A longer CS-US and inter-trial interval was used in conjunction with high substrate temperature between trials and a more natural pseudo-tunnel one-way escape route.
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