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octopus underwater marine life cephalopod tentacles suction cups eyes beak mantle arms legs invert invertebrate animal wildlife nature ocean sea water biology marinebiology science education learning discovery exploration fascination captivating interesting intriguing mysterious alien creature evolution adaptation survival intelligence behavior communication problem solving tool use cognition emotion consciousness cephalopod octopus squid cuttlefish nautilus ammonite belemnite evolution paleontology fossil extinction biology marine biology zoology invertebrate animal wildlife nature ocean sea water underwater habitat environment ecosystem food chain predator prey symbiosis mutualism commensalism parasitism competition survival adaptation evolution cephalopod octopus squid cuttlefish nautilus ammonite belemnite evolution paleontology fossil extinction biology marine biology zoology invertebrate animal wildlife nature ocean sea water underwater habitat environment ecosystem food chain predator prey symbiosis mutualism commensalism parasitism competition survival adaptation