Head drawings: genus Natrix(Serpentes: Colubridae) - compiled by Van Wallach Home

Natrix astreptophora (from Trape 2023)
Natrix helvetica (from Lanza 1983)
Natrix maura (from Barbadillo-Escriva 1987)
Natrix maura (from Bonaparte 1832-41)
Natrix maura (from Böhme 1999)
Natrix maura (from Corti & al. 2011)
Natrix maura (from Meirte 1992)
Natrix maura (from Phisalix 1922)
Natrix maura (from Saint Girons 1956)
Natrix maura (from Salvador 1998)
Natrix maura (from Schleich & al. 1996)
Natrix maura (from Bruno & Maugeri 1990)
Natrix maura (from Corti & al. 2011)
Natrix maura (from Corti & al. 2011)
Natrix maura (from Lanza 1983)
Natrix maura (from Salvador & Pleguezuelos 2013)
Natrix maura (from Lanza 1983)
Natrix maura (from Salvador & Pleguezuelos 2013)
Natrix maura (from Lanza 1983)
Natrix natrix (from Böhme 1999)
Natrix natrix (from Orlov & Tuniyev 1992)
Natrix natrix (from Böhme 1999)
Natrix natrix (from Orlov & Tuniyev 1992)
Natrix natrix (from Böhme 1999)
Natrix natrix (from Orlov & Tuniyev 1992)
Natrix natrix (from Corti & al. 2011)
Natrix natrix (from Source unknown)
Natrix natrix (from Source unknown)
Natrix natrix (from Anufriev & Bobretsov 1996)
Natrix natrix (from Baier & al. 2009)
Natrix natrix (from Bannikov & al. 1977)
Natrix natrix (from Barbadillo-Escriva 1987)
Natrix natrix (from Barus & Oliva 1992)
Natrix natrix (from Bonaparte 1832-41)
Natrix natrix (from Bruno & Magueri 1990)
Natrix natrix (from Böhme 1999)
Natrix natrix (from Fuhn & Vancea 1961)
Natrix natrix (from Moravec & al. 2015)
Natrix natrix (from Orlov & Tuniyev 1992)
Natrix natrix (from Phisalix 1922)
Natrix natrix (from Saint Girons 1956)
Natrix natrix (from Salvador 1998)
Natrix natrix (from Bruno & Maugeri 1990)
Natrix natrix (from Corti & al. 2011)
Natrix natrix (from Najbar & Borczyk 2012)
Natrix natrix (from Najbar & Borczyk 2012)
Natrix natrix (from Lanza 1983)
Natrix natrix (from Lanza 1983)
Natrix natrix (from Lanza 1983)
Natrix natrix (from Bonaparte 1832-41)
Natrix natrix (from Corti & al. 2011)
Natrix natrix (from Koch 1862)
Natrix natrix (from Lanza 1983)
Natrix natrix (from Najbar & Borczyk 2012)
Natrix natrix (from Corti & al. 2011)
Natrix natrix (from Lanza 1983)
Natrix natrix (from Najbar & Borczyk 2012)
Natrix natrix (from Corti & al. 2011)
Natrix natrix (from Salvador & Pleguezuelos 2013)
Natrix natrix (from Salvador & Pleguezuelos 2013)
Natrix tessellata (from Source unknown)
Natrix tessellata (from Amr & Disi 2011)
Natrix tessellata (from Barus & Oliva 1992)
Natrix tessellata (from Bonaparte 1832-41)
Natrix tessellata (from Bruno & Maugeri 1990)
Natrix tessellata (from Böhme 1999)
Natrix tessellata (from Corti & al. 2011)
Natrix tessellata (from Fuhn & Vancea 1961)
Natrix tessellata (from Liu & al. 2011)
Natrix tessellata (from Moravec & al. 2015)
Natrix tessellata (from Nikolsky 1916)
Natrix tessellata (from Phisalix 1922)
Natrix tessellata (from Scortecci 1932)
Natrix tessellata (from Werner 2016)
Natrix tessellata (from Gasperetti 1988)
Natrix tessellata (from Lanza 1983)
Natrix tessellata (from Gasperetti 1988)
Natrix tessellata (from Lanza 1983)
Natrix tessellata (from Lanza 1983)