6. Blue-ringed octopus Don't go by its size, in spite of being so tiny, it is widely regarded as one of the world's most venomous animals.
It lives in tidal regions ranging from Australia to Japan and is frequently encountered by people wading in tide pools.
If provoked or stepped on, it will bite.
Blue-ringed octopus poison has no anti venom and can kill an adult human within minutes.
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