Hemi mouse builds a . . . um, not sure!

Hemi mouse has been industriously enjoying herself constructing a big pile of hemcore (their bedding substrate) in part of the cage. No idea why but as you can see she is very pleased with it and obviously enjoying herself immensely.
Sadly Hemi does have inoperable tumours but as you can see they don't bother her in the slightest. When she shows signs that she is no longer comfortable I will take her to be put to sleep at the vets. For now though she has a great quality of life.
The girls were adopted from www.primrosemouserescue.co.uk