octopus vulgaris in the mediterranean sea hoovering over the stone bottom

underwater reef sea fish coral ocean animal organism aquarium invertebrate wildlife alive octopus swimming aegean oktopus vulgaris mediterranean beneath posedonia algae hoovering over bottom stone aegean sea algae alive animal animals wild behavior blue camouflage cephalopod change close up colorful common octopus dive ecology environment exotic fish greece ikaria intelligent invertebrate kraken life live marine marine fauna mediterranean nature ocean pulpo real research snorkeling surface swim tentacles undersea undersea underwater vulgaris water