Fabio Pupin / Peringuey's desert adder, (Bitis peringueyi), sidewinding on dune, Namib desert, Namibia, February . Non-ex.

Daniel Heuclin / Horned viper (Vipera ammodytes) in natural setting, Turkey.

Christophe Courteau / Peringuey's adder (Bitis peringueyi) buried in sand, flicking tongue, hunting, Namib Desert, Namibia.

Ingo Arndt / Dwarf puff adder / Sidewinder snake crossing sand {Bitis peringueyi} Namibia

Juan Carlos Munoz / Namib sand snake (Psammophis namibensis) in sand dunes, Swakopmund, Erongo Region, Namibia.

Bruno D'Amicis / Sand viper (Cerastes vipera) sidewinding on sand dunes. Grand Erg Oriental, Kebili Governorate. Tunisia.

Chris Mattison / Sidewinder (Crotalus cerstastes) in sand dunes, Anza-Borrego Desert State Park, California, USA, May.

Daniel Heuclin / Sand Viper (Cerastes vipera) side winding across sand dunes, near Chingueti, Mauritania

Daniel Heuclin / Sand Viper (Cerastes vipera) in shade of grass, Erg Chigaga, Morocco

Pete Oxford / Eastern Diamondback Rattlesnake (Crotalus adamanteus), Little St. Simon's Island, Georgia

Tony Phelps / Southern Dwarf Adder (Bitis armata) climbing in dune thicket. De Hoop Nature Reserve, Western Cape, South Africa, January.

Edwin Giesbers / Western diamondback rattlesnake {Crotalus atrox} captive, from Texas, USA