Patterns and Frequency of Activity in a High Altitude Population of the Iguanid Lizard, Sceloporus jarrovi

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Abstract
The frequency of activity of the viviparous iguanid lizard Sceloporus jarrovi in a high altitude (2895 m) population was determined by hourly censuses of visible lizards. Any given lizard was seen an average of six days out of seven, and within days activity did not vary with either age or sex of the lizard. Patterns of lizard activity throughout the day were dictated by the thermal environment: on clear days, high levels of insolation prevented lizards from basking in the sun at midday, whereas virtually the entire population was basking and visible simultaneously on a cloudy day.