The Mongolian gerbil or Mongolian jird (Meriones unguiculatus) is a rodent belonging to the subfamily Gerbillinae. Their body size is typically 110–135 mm (4+1⁄4–5+1⁄4 in), with a 95–120 mm (3+3⁄4–4+3⁄4 in) tail, and body weight 60–130 g (2–4+1⁄2 oz), with adult males larger than females. The animal is used in science and research or kept as a...