Solvin Zankl / Dwarf puff adder / Peringueys sidewinding adder (Bitis peringueyi) buried in sand with just eyes visible, Namib desert, Namibia

Solvin Zankl / Dwarf puff adder / Peringueys sidewinding adder (Bitis peringueyi) camouflaged against sand, Namib desert, Namibia

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

Fred Bavendam / Porcupinefish (Diodon nicthemerus) swallows water to puff itself up and points its spines outward as a defense against predators, South Australia

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.

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

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

Fabio Pupin / Horned adder, (Bitis caudalis), Namib desert, Namibia, February . Non-ex.