The cycling of reproductive organs, fat and brightness of orange spotting of free-living female collared lizards Crotaphytus collaris from North Central Kansas was described quantitatively. Orange spots changed from faint to maximum brightness in less than 12 hours. Maximum brightness was achieved prior to ovulation and 10 days prior to oviposition. Collared lizards produced only a single clutch of eggs per season in North Central Kansas.
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Gary W. Ferguson (1976) studied this question.