Meet blue-ringed octopuses, members of the genus Hapalochlaena. They inhabit coral reefs in the Indian and Pacific oceans. Though they usually measure less than 8 inches (20. 3 cm) at their largest, keep your distance: Blue-ringed octopuses are among the world’s deadliest cephalopods. Their venomous bite can instantly paralyze, and even kill, a human.
Photo: Angell Williams, CC BY 2.0, flickr
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