Despite perceived similarities to human observers, the reflectance spectrum of orange skin is much more similar to brown and redhead coloration than dewlap coloration.

Note especially the red spectrum (605-700nm). Orange and brown lizards differed significantly in their red chroma, and thus, their pigment concentration. Orange and redhead patches did not differ significantly in red chroma and may thus have similar pigment concentrations. Reflectance curves were smoothed for presentation after all statistical analyses were conducted.