Nick Garbutt / Sumatran pit viper (Trimeresurus sumatranus) juvenile on tree trunk, in tropical rainforest. Danum Valley, Sabah, Borneo, Malaysia.

Georgette Douwma / Shortfin lionfish (Dendrochirus brachypterus). Lembeh Strait, North Sulawesi, Indonesia.

Guy Edwardes / Mozambique spitting cobra (Naja mossambica) spitting venom. Kruger, South Africa. Controlled conditions.

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

Daniel Heuclin / Sunda island pitviper (Trimeresurus insularis) in tree, Komodo Island.

Solvin Zankl / Portuguese man-of-war (Physalia physalis) colony, underwater Sargasso Sea, Bermuda

Solvin Zankl / Portuguese Man-of-War (Physalia physalis) close up of tentacles, Sargasso Sea, Bermuda

MD Kern / Palo Alto JR Museum / Black Widow (Latrodectus hesperus) spider walking silhouetted against light, captive.

Guy Edwardes / Mozambique Spitting Cobra (Naja mossambica) ejecting venom, Kruger, South South Africa, Controlled conditions

Guy Edwardes / Mozambique Spitting Cobra (Naja mossambica) ejecting venom Kruger, South Africa, Controlled conditions.

Jeff Rotman / Irula Snake Tribe member holding vials of snake anti-venom for Viper, Krait and Cobra bites. Southern India.

Michael & Patricia Fogden / Russell's Viper (Daboia russelii) being milked for venom, Madras India