This underwater snail has a tooth-like stinger which acts like a harpoon. It has enough venom to kill a human as it paralyses the respiratory muscles.

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.

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.

This jellyfish has a venom that attacks a human's cardiac and nervous systems and if it stings you, you have virtually no chance of surviving unless treated straight away.

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.

With a jaw this size the crocodile doesn't need venom.

7. RED-BACK SPIDER

6. FUNNEL-WEB SPIDER