Support WBURShifting Colors Of An Octopus May Hint At A Rich, Nasty Social LifePlay02:39Download AudioNell GreenfieldboyceJanuary 28, 2016 ShareThe dark red color and looming posture of this Octopus tetricus likely signals menace to another octopus nearby, say scientists who studied 186 octopus interactions in 52 hours of underwater video. (David Scheel/Current Biology)
