Nudibranchs, pronounced 'noodibrank', are a mollusc - basically speaking - a slug, and come in an enormous variety of sizes and colours.
Nudibranch itself means 'naked gills'. the plumes you see on them are literally their gills for breathing.
They are found in most habitats in all the oceans of the world.
Most nudibranchs are carnivorous. Some feed on sponges, others on hydroids, others on bryozoans, and some are cannibals, eating other sea slugs, or, on some occasions, members of their own species. Other groups feed on tunicates, barnacles, or anemones .
Nudibranchs mainly live in the ocean(salt water). They can be found in tide pools and deep water too. Most abundant in tropical waters, they are also found in arctic waters and everything in between too. There are even a few species that live in fresh water!
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