The complex biology of an octopus shines through as a brief snippet displays its unique ability to camouflage in water.

In the video, the diver, on encountering the octopus, pokes it and tries to grab the creature. The octopus quickly retaliates ...

That's the reality for those unlucky enough to be bitten by a blue-ringed octopus. Initially its bite is painless. But quickly the fast-acting toxin goes to work, paralysing its target.