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Photo 1. Dickerson's collared lizard (Crotaphytus dickersonae; female above, male below) basking in the mountains northeast of Bahia Kino, Sonora, Mexico. Note the strong colour contrast of the male's blue coloration against the reddish rocks. The equally striking chromatic orange barring on the female is present only when gravid. Photo by William Wells.

Photo 2. Illustration of the chromatic yellow tail often seen in female Crotaphytus dickersonae irrespective of reproductive state. Photo by William Wells.

Photo 3. Adult male Crotaphytus dickersonae on coastal rocks near Kino Nuevo. Note not only the extent of blue backgrounds comprising sea and sky, but also the bluish veiling light effect of their radiance on the appearance of Isla Tiburon in the background. Photo by Paul S. Hamilton.

Photo 4. Adult male Crotaphytus dickersonae in its natural habitat on Isla Tiburón. Photo by Barney Oldfield.

Photo 5.Crotaphytus dickersonae habitat in the hills northeast of Bahia Kino, Sonora, Mexico. Photo by Barney Oldfield.

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