Male blue-lined octopuses inject females with venom to paralyse them before mating and avoid being eaten after sex.

A big octopus. Where? You look around. No octopus. Just rocks, covered with corals and sponges of different colors. Amba gestures insistently: big octopus! You look where he’s pointing.

Different species of blue-ringed octopuses occupy different ... and can find their homes within reefs or seagrass beds. The greater blue-ringed octopus is native to the tropical western Pacific, ...