Abstract
Thyroxine secretion rate (TSR) 131I maximal uptake, and the ratio of neck-to-thigh counts (N:T) were measured in two species of desert lizards. Maximum thyroid 131I uptake was reached at 24 hr in Dipsosaurus dorsalis and at 48 hr in Callisaurus draconoides. The N:T ratios were higher in C. draconoides than in D. dorsalis, but the average TSR values were about the same in both species. The young lizards of each species have a relatively higher TSR per body weight than the older or larger lizards.
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