every year in Australia than any other group of snakes. It must be noted that Australia reports on average well under 10 snake bite deaths per year. Common death adder The Common death adder (Acanthophis antarcticus) is a highly venomous snake species with a 50–60% untreated mortality rate. It is also the fastest striking venomous snake in the world. A death adder can go from a strike position, to strike and envenoming their prey, and back to strike position again, in less than 0.15 seconds. The SC value is 0.4 mg/kg and the venom yield per bite can range anywhere from 70–236 mg. Unlike other snakes that flee from approaching humans crashing through the undergrowth, common death adders are more likely to sit tight and risk being stepped on, making them more dangerous to the unwary bushwalker. They are said to be reluctant to bite unless actually touched. Tiger snake Tiger snakes (Notechis spp) are highly venomous. Their venoms possess potent neurotoxins, coagulants, haemolysins and myotoxins and the venom is quick-acting with rapid onset of breathing difficulties and paralysis. The untreated mortality rate from tiger snake bites is reported to be between 40 and 60%. They are a major cause of snakebites and occasional snakebite deaths in Australia. The African Tiger snake (Telescopus semiannulatus), 60–70 cm long, on the other hand, is rear-fanged and only mildly venomous and not dangerous to humans. Green mambas Green mambas (Western, Eastern, and Jameson's) are all highly venomous snakes that can be highly aggressive and unpredictable in disposition. They can suddenly go from a state of relative calm to an extremely agitated and dangerous state. All three species have a tendency to strike repeatedly with little provocation, although they are generally much less aggressive than their larger cousin, the black mamba. All three species of green mamba are highly arboreal, alert, extremely quick, and agile. Although the potency of their venom is similar to the more venomous cobra species, mamba venom is much more rapid-acting and the dendrotoxins contained in mamba venom is generally more devastating in nature to the central nervous system, causing more severe neurotoxicity in more rapid fashion. The Western green mamba (Dendroaspis viridis) is highly venomous and aggressive with a of 0.7 mg/kg SC and the average venom yield per bite is approximately 100 mg. The mortality rate of untreated bites is unknown but is thought to be very high