Cut it in half and count the rings.
A young gerbil (1/2 - 2 1/2 yrs) is active. Its eyes are wide open and it is always energetic. As it starts to age, you will notice he will slow down a bit. Elderly gerbils sleep more often, too.
8
Because she is scared or excited and wants to tell another gerbil. Or she is calling for a male gerbil to mate with.
at about 5 months
If your gerbil is healthy it will have soft shiny fur,bright eyes and a clean nose.
That means that the gerbil is at the right age and wants to mate.
8-12 weeks of age
boys will have the sack girls will not
Yes. You can tell if your gerbil is scared if he shivers or if he chatters his teeth
you can tell because if its nose changed a different color like light purple
8-12 weeks of age
I am not sure that records were ever kept of that sort of thing, so we can not tell you.