Rex sole - The rex sole Glyptocephalus zachirus is a flatfish of the family Pleuronectidae. Locally it may also be known as a witch or threadfin sole (due to the filamentous pelvic fin on the eyed surface). It is a demersal fish that lives in temperate waters on sand or mud bottoms at depths of up to 900 metres (3000 ft) though it is most commonly found between 61 and 500 metres (200 and 1640 ft). Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
A:
Animal