The cone snail is an underwater snail with a tooth-like stinger which acts like a harpoon. It has enough venom to kill a human as it paralyses the respiratory muscles. The cone snail's shell is pretty and colourful, so tourists often unknowingly pick them up:
The most venomous fish in the world, the stonefish is not aggressive, however its proximity to shores and ability to camouflage itself in coral makes it easy for people to accidentally touch or brush against. It has 13 dangerous spines and a dorsal fin, and when humans are stung it causes death to tissues:
The funnel-web spider sets up a trip-wire so it knows when prey is passing by, and its venom can kill a human in 15 minutes:
The blue-ringed octopus changes from a muddy orange colour to a vibrant blue when it strikes. It has venom 10,000 times more toxic than cyanide and can kill in 90 minutes. The size of a golf ball, its beak can penetrate a wetsuit:
See the full gallery here.
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