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. Tutufa nigrita -  Tutufa (Tutufella) nigrita common name the blackened frog shell is a species of sea snail a marine gastropod mollusk in the family Bursidae the frog shells.
Animal