Either your gerbil is pregnant, or they have eaten too many sunflower seeds in one sitting. Try removing sunflower seeds from their diet. If they are still fat after one week, then your gerbil is probably expecting. For info on how to take care of baby gerbils, ask on this site 'How do you take care of baby gerbils?'.
Fat-tailed Gerbil was created in 1880.
It means your Gerbil is overweight and eing regular sized or your gerbil is dying. - GerbilExpert
it eats insects
It is a well known fact that fat tailed gerbils are more aggressive than their skinny tailed counterparts. Therefore, the fat tailed gerbil is likely to attack the skinny tailed gerbil because it is jealous of its dashing good looks. However, the extra weight added by the tail will slow the gerbil down to the point of its exhaustion by the time it has crossed the tank. The skinny tailed gerbil will then take advantage of the pooped fat tailed gerbil and begin to claw at vital spots on its body. After a few minutes the fat tailed gerbil will be turned into a finger coat and sold to the highest bidder. These quality finger coats are normally valued at 1,000 dollars but avid collecters are willing to pay up to 5,000 for the rare ones.
Pregnancy, overeating caused by stress or excitement, and if I see anymore ways I'll tell you.
because you dont have a wheel or you are not giving it veggies
Because it eat's unheathy food all the time.
i give my gerbils cunipic gerbil complete food beacause it helps there teeth it has natural ingrediants its low in fat and is high in protein and has high fibre levels in it i would highly recommend it you can buy it in most pet shops.
no sun flower seeds in food
Depends If you Have A Fat Bottom and have big teeth and a tail and like to eat sunflower seed then yes!
because hes just a big fat stupid gerbil and nobody likes gerbils.
Most gerbils will LOVE seeds as they contain a lot of fat, which is why it is best to offer them as a treat, as putting them in their food can cause them to selective feed and become overweight. Your gerbil probably sees the seeds you give them as some kind of "treasure" and so will hide them so no other gerbil can get to them.