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underwater photography sea slug nudibranch marine life coral reef colorful ocean wildlife invertebrate mollusk gills tentacles chromodoris macro photography nature animal underwater world habitat environment conservation biodiversity ecosystem symbiosis predation behavior photography macro close up underwater reef coral gastropod species biology animal behavior food chain mutualism commensalism parasitism herbivory carnivory omnivory detritivory filter feeding suspension feeding deposit feeding predatory behavior defensive behavior reproductive behavior social behavior communication learning memory