“Our data reveal substantial variation among chameleon species in head morphology, limb and tail length, and dorsal crest development. Almost all variables increase interspecifically with body size; when size effects are removed, two patterns are evident. First, all traits within a functional group are correlated, but few correlations occur between traits in different functional groups. For example, relative lengths of limb elements are highly correlated, but few significant correlations exist between limb and head elements. Second, terrestrial – defined as those species known to use the ground at least occasionally – and arboreal species differ in limb and head measurements.”…
https://academic.oup.com/biolinnean/article/76/1/91/2639735?login=false
https://academic.oup.com/biolinnean/article/76/1/91/2639735?login=false