Most nudibranchs are benthic, meaning they crawl along the sea
floor, however, some are able to swim. One such nudibranch is the
Spanish Dancer which, paired with its monumental size (for a
nudibranch, anyway) of up to 30cm, is quite a spectacle to behold.
To navigate their surroundings, nudibranchs use the two horns
located on their head called rhinophores, which are chemical
receptors used to find food and a mate. Like a tortoise's head,
they can be withdrawn into their bodies for protection.