Killer Geographer Cone Snail
One sting from this predatory snail could kill many adults. One component of its venom, which needs to be deadly and fast-acting to swiftly kill its fish prey, has an LD50 of 0.012.
It contains neurotoxins that in humans affect vision and speech.
Australia’s only recorded death occurred in 1935. Because stings can be painless, people may not realise they have been stung.