Back in my Tucson days where some guy took me outside with a thermo-gun, whereupon we noticed some smallish local lizard basking on a large boulder..its was of average warm little lizard speed and acuteness(ie keeping a sharp eye on the monkeys, with one foot on the gas....) After doing the old point and shoot with the T-gun, I was rather astounded to discover the little fella(the lizard that is...)was basking on a spot where the base temp was 186 degrees F!! And in full sun to boot! The lizard was just hanging and jiggin from the monkeys getting too close in attempts to dispell their obvious disbelief!! After that day i bumped the basking temps on my rough necks upto 170F (from 130-140F)There was a considerable shift in their activity levels,ultimately leading to their rather regular production of eggs. Of course they had a large cage with a considerable thermocline(down to about 70F or so)but they used the high temp site multiple times daily with no visible adverse effects.
Guy

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