To protect the flesh of the orange the peel covers the orange.
Before you normally eat an orange you would peel off the skin easily with your fingers or a knife.
Depending on the type of orange the color of the peel may be a bit different.
As well people sometime grate off some of the peel and use it as a zest for thing such as baking.
So can gerbils eat orange peels at all?
No, they cannot eat the peel at all due the acidic nature of an orange peel.
Gerbils do not cope well at all with acidic foods and therefore it would make them sick if they were to try and eat any acidic.
Make sure to avoid feeding this food to your gerbil.