Therefore , a healthy fat - tailed gerbil should have a nicely rounded tail .
The fat - tailed gerbil stores fat and water in its tail , in the same way that the camel stores fat in its hump .
A healthy fat - tailed gerbil should have a nicely rounded tail .
The fat - tailed gerbil stores fat and water in its tail , in the same way that the camel stores fat in its hump .