Bruno D'Amicis / Desert monitor (Varanus griseus) moving across sand dunes, showing characteristic tracks, in the Sahara, Tunisia.

Daniel Heuclin / Desert monitor (Varanus griseus griseus) occurs in Sahara Desert. Controlled conditions.

Daniel Heuclin / Desert monitor (Varanus griseus griseus) occurs in Sahara Desert. Controlled conditions.

Daniel Heuclin / Desert monitor (Varanus griseus griseus) occurs in Sahara Desert. Controlled conditions.

Bruno D'Amicis / Desert monitor (Varanus griseus) moving across sand dunes, Sahara, Tunisia.

Gertrud & Helmut Denzau / Desert monitor (Varanus griseus) basking with mouth open, Badkhyz Reserve, Turkmenistan

Gertrud & Helmut Denzau / Desert monitor (Varanus griseus) smelling the air with its tongue, Badkhyz Reserve, Turkmenistan

Daniel Heuclin / Desert monitor (Varanus griseus) attempting to eat a Sand Viper (Cerastes vipera) a venomous snake which is defending itself by biting the monitor's neck, near Chinguetti, Mauritania

Ugo Mellone / Desert monitor (Varanus griseus) on rocky desert landscape, Aydar, Southern Morocco, Africa.