a close-up picture of a red and white spanish dancer, hexabranchus sanguineus, on a blue background. the

animal background backlit blue bright closeup colorful colourful dancer dive diving dorid ecosystem fauna gastropod gato hexabranchidae hexabranchus island malapascua marine mollusc mollusk nudi nudibranch ocean one people philippines photography red sanguineus scuba sea slug spanish tropical tropics undersea underwater unusual water wildlife