I have seen Mimic Octopus only on sandy bottoms and usually a fairly shallow depths. It is possible that these animals are venomous similar to the Blue Ringed Octopus. Nudibranchs Nudibranchs have always fascinated me as they look like the creations of talented painters who enjoy using bright colors. Delicate, they seem unprotected and they are the underwater analogs of butterflies. They survive in an eat or be eaten world despite, or perhaps because of, their bright coloration.
All nudibranchs are carnivores consuming slow-moving or stationery prey.
In most species the gills or branchial plumes are outside. All sea slugs have the rasplike tongue called radula and all have a fleshy foot that propels them forward by muscular contractions or by the concerted movement of hairlike cilia. Nudibranchs often get their color from what they eat. Nudibranchs defend themselves by secretion of noxious chemicals that predators find distasteful. Nudibranchs sense those of their own kind chemically and mate by positioning themselves head to toe so that their right sides are close together.