Mongolian gerbil

The Mongolian gerbil, also referred to as the Mongolian jird (Meriones unguiculatus), is a rodent belonging to the subfamily Gerbillinae. Their body size is typically 110–135 mm (4¼–5¼ in), with a 95–120 mm (3¾–4¾ in) tail, and body weight 60–130 g (2–4½ oz), with adult males larger than females. The animal is used in science for research or kept as a small house pet. Their use in science dates back to the later half of the 19th century, but they only started to be kept as pets in the English-speaking world after 1954, when they were brought to the United States. However, their use in scientific research has declined.

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