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

Pete Oxford / Puff Adder (Bitis arietans) near wetland, Marakele National Park, Limpopo, South Africa

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

Tony Phelps / Puff adder (Bitis arietans) moving into ambush position under a bush, DeHoop Nature Reserve, Western Cape, South Africa, January.

Daniel Heuclin / Rhinoceros viper (Bitis nasicornis), from Central Africa, captive, July.

Tony Phelps / Puff adder (Bitis arietans) juvenile amongst succulent plants in karoo habitat, Little Karoo, South Africa

Jabruson / Close up of skin of Puff adder {Bitis arietans} Tsavo East NP, Kenya

Tony Phelps / Extracting venom from Puff adder {Bitis arietans} at Liverpool school of tropical medicine, UK

Ann & Steve Toon / Puff adder (Bitis arietans), Zimanga game reserve, KwaZulu-Natal, South Africa.

Fabio Pupin / Namaqua dwarf adder, (Bitis schneideri), Little Namaqualand, South Africa, February . Non-ex.

Fabio Pupin / Peringuey's desert adder, (Bitis peringueyi), hiding under sand, Namib desert, Namibia, February . Non-ex.

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