{{Short description|Feature of a amphibians' and reptiles' head}} In snakes and amphibians, the '''canthus''', '''canthal ridge''' or ''canthus rostralis''<ref name="SB95">Spawls S, Branch B. 1995. ''The Dangerous Snakes of Africa''. Ralph Curtis Books. Dubai: Oriental Press. 192 pp. {{ISBN|0-88359-029-8}}.</ref> is the angle between the flat crown of the head and the side of the head between the eye and the snout,<ref name="Mal03">Mallow D, Ludwig D, Nilson G. 2003. ''True Vipers: Natural History and Toxinology of Old World Vipers''. Krieger Publishing Company, Malabar, Florida. {{ISBN|0-89464-877-2}}.</ref> or more specifically, between the supraocular scale and the rostral scale. It is defined as a sharp ridge in many viperids, but is rounded in most rattlesnakes, for example.<ref name="C&L04">Campbell JA, Lamar WW. 2004. The Venomous Reptiles of the Western Hemisphere. Comstock Publishing Associates, Ithaca and London. 870 pp. 1500 plates. {{ISBN|0-8014-4141-2}}.</ref><ref>Wareham, David C. 2005. Dictionary of herpetological and related terminology. Elsevier. {{ISBN|0-444-51863-0}}</ref>
==References== {{Reflist}}
Category:Snake scales
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