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There are apparently a number of viper species with horns but Bitis cornuta is apparently the most widespread. http://www.eol.org/pages/1057053Maybe a snake expert can confirm.
This baby snake (Vípera cornuta, or horned viper) is extremley dangerous. I founded it during a geological mission in Mauritania, sleeping early in a fresh morning, exposed to the sun in a relatively humid gully crossing a cliff, south of the Mauritanian Desert ( Coordinates: 18º 18,75'N ; 10º 52,8'W, elev.:540m)
Lat: 18.30, Long: -10.88
Spotted on May 14, 2010 Submitted on May 14, 2010