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| | Viper,Reptiles,Amphibians,Viper Picture Gallery Collection,Viper Pictures,Encyclopedia,Viper (Site not responding. Last check: 2007-10-24) |
 | | When preparing to bite, a viper erects these fangs to a perpendicular position by rotating each maxillary on the front end of the supporting prefrontal bone. |
 | | The viper family, Viperidae, is usually divided into two subfamilies: the Viperinae, or true vipers, and the Crotalinae, containing the PIT VIPERS. |
 | | Some classifications, however, regard the pit vipers as a separate family, the Crotalidae. |
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