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

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

Daniel Heuclin / Asp Viper (Vipera aspis) captive

Daniel Heuclin / Asp viper (Vipera aspis) head portrait in profile. France, Europe. Controlled conditions.

Fabio Pupin / Nose-horned viper, (Vipera ammodytes), Croatia, April . Non-ex.

Fabio Pupin / Asp viper, (Vipera aspis), Alps, Italy, July . Non-ex.

Fabio Pupin / Nose-horned viper, (Vipera ammodytes), Croatia, April . Non-ex.

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

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

Daniel Heuclin / Horned viper (Vipera ammodytes) held in human hand, showing fangs, Turkey.

Bruno D'Amicis / Melanistic Asp viper (Vipera aspis) moving between the roots of ancient tree in old growth Beech (Fagus sylvatica) forest. Abruzzo, Lazio and Molise National Park / Parco Nazionale d'Abruzzo, Lazi...

Alain Dragesco-Joffe / Horned viper (Cerastes cerastes) Tenere, Sahara Desert, Niger.