Actually glass aquariums are not bad at all for young/baby tortoises. Some have no problem with the glass. Others, if they do, a simple fix of attaching paper or other item to block the view works great.Hi, Yes this is very common. Their can be a lot of variety in colouring.
Tortoise shouldnt be kept in glass terrariums. They do not understand they can not walk through it. Only creates stress, that's why he is head butting the glas window.