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. Author manuscript; available in PMC: 2013 Feb 1.
Published in final edited form as: Comp Biochem Physiol A Mol Integr Physiol. 2011 Nov 4;161(2):230–242. doi: 10.1016/j.cbpa.2011.10.029

Figure 12.

Figure 12

Histograms showing the distribution of total body length in various snakes. Arboreal viperid species (which have comparatively mid–body heart positions and elongate vascular lungs) are less than one meter in mean length and significantly shorter than arboreal species in other taxa (ANOVA, Fisher's PLSD, mean difference = 56.72 cm, P = 0.0025). The shorter total body length of the arboreal viperids limits the absolute length of the pulmonary vasculature and superior systemic arteries between the heart and head.