Answer the following question: Elasipodida is an order of sea cucumbers. They are somewhat unusual in appearance in comparison with other sea cucumbers having numerous appendages including conical papillae and leaf-like tentacles. Although many species are benthic a number are pelagic and may have their appendages modified to form sails or fins. Most members of the order inhabit deep-sea environments like Enypniastes. 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?
Answer:
Animal