alive octopus underwater swimming in the aegean sea

underwater sea reef fish ocean animal coral aquarium organism coast invertebrate wildlife reptile alive octopus swimming aegean oktopus vulgaris mediterranean beneath posedonia algae rocks 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