Octopus sitting on tropical coral reef showing tentacle and suction cups

octopus reef octopus octopod octopoda cephalopoda cephalopod squid cuttlefish nautilus tentacle suction cups arms eigthlegged eigthlimbed mollusc marine animal marine species maritime sea sealife undersea underwater ocean oceanic aqua aquatic water saltwater reef coral corals environment habitat tropical exotic nature natural travel scuba scuba diving