Q:The mosaic pleurobranch scientific name Pleurobranchus albiguttatus is a species of sea slug a sidegill slug a marine gastropod mollusc in the family Pleurobranchidae. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Animal