Mongolian gerbil They are somewhat larger than mice, with a body about long (and a tail of similar length), with a body mass averaging in females and in males. The Mongolian gerbil is classified as a "prohibited new organism" under New Zealand's Hazardous Substances and New Organisms Act 1996, preventing it from being imported into the country. The species is also prohibited in the US state of California. "Meriones unguiculatus" evolved on the semideserts and steppes of Mongolia. There, they developed long legs for jumping and running from predators, teeth to deal with hard seeds and plant matter, and water conservation techniques
Fat-tailed gerbil have them. A healthy fat-tailed gerbil has bright eyes, is lively, and has a soft coat. They are dry and clean. Sick fat-tailed gerbils get lethargic and are not lively. Preventing illnesses is usually more effective than curing, especially for the fat-tailed gerbil; curing them is usually difficult. Fat-tailed gerbils are so small that even vets do not always know how they must treat the animal. Catching a cold can be fatal, although the biggest threats for a fat-tailed gerbil are draught and moisture. Hyperthermia, improper diet, and stress can lead to health problems. Not much is known about diseases