Answer the following question: Acanthoscaphites is an extinct genus of cephalopod belonging to the Ammonite subclass. The average diameter of its shell was approximately three fourths of an inch but some specimens have been found with a diameter of slightly over two inches. 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