When they're alarmed, blue-lined octopuses display iridescent blue rings on their arms to ward off approaching predators. Totti via Wikimedia Commons under CC BY-SA 4.0 Animals have evolved many ...

Octopuses have gotten a reputation for being cunning camouflagers and intelligent creatures. But some are known for a more ominous reason: They're deadly. One group — the blue-ringed octopus (genus ...

During mating, some male octopuses inject females with their potent venom to paralyse them – and avoid being eaten by their mates. Typically, animals use venom to kill prey or defend themselves from ...

Scientists have found that male blue-lined octopuses inject venom and paralyse females during sex to avoid being killed and cannibalised by their much larger partners. The male octopus of this species ...