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. Leptophis mexicanus -  Leptophis mexicanus commonly known as the Mexican parrot snake is a species of medium-sized slender snake of the Colubridae family. It is endemic to the Americas.
The answer to this question is:
Animal