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. Orconectes immunis - Orconectes immunis the calico crayfish or papershell crayfish is a species of North American freshwater crayfish which has also been introduced to Europe where it lives along the Upper Rhine. It lives in slow-flowing bodies of water and can survive by burrowing if they dry out.
A:
Animal