Horror moment octopus STRANGLES panicking diver rushing to the surface for air after spraying blinding ink in his face / The male blue-lined octopus injects females with venom during sex to avoid being eaten, study shows / Male blue-lined octopuses paralyze females before mating to prevent being eaten / Male octopuses paralyse partners with venom during sex to avoid being eaten, scientists find / Male octopus injects female with venom during sex to avoid being eaten / 'Octopus boom is decimating our shellfish catch' / Octopuses changing colour rapidly incur a high metabolic cost / Watch as male model is dragged underwater by OCTOPUS - as beast crawls over his body & snares him in its tentacles / Octopus arms have segmented nervous systems to power extraordinary movements / Octopuses are a new animal welfare frontier--what scientists know about consciousness in these unique creatures