Young et al. (Brevia, 2 April 2004, p. 65) purported to identify the mechanism behind the origin and maintenance of horns in horned lizards. Unfortunately, they asserted rather than demonstrated the current function of horns and failed to recognize the crucial distinction between adaptation and exaptation. As a result, the question implied in the title of their article-how the horned lizard got its horns-remains unanswered and, in the absence of an historical perspective, is unanswerable.
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