The Usambara three-horned chameleon (Chamaeleo deremensis) from Tanzania becomes spotted with black when irritated. It is one of the 420 or so reptiles illustrated in A Field Guide to the Reptiles of East Africa by Stephen Sprawls et al. (Natural World, £29.95).
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Rare and unusual. Nature 414, 396 (2001). https://doi.org/10.1038/35106630
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DOI: https://doi.org/10.1038/35106630