Please answer the following question: Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Volga undermouth - The Volga undermouth or Volga nase (Chondrostoma variabile) is a species of cyprinid freshwater fish. This one lives in the Emba Ural and Volga drainages of the Caspian Sea basin and the Don River drainage of the Black Sea basin.
Answer:
Animal