How to make a bird cage?

How can i make a bird cage into a rat cage?

• I want to put them in this cage because it's a bit bigger than their rat tank, but i don't know how to make ledges, (different levels/storeys in the cage) ... Any ideas?

• Answer:

  In our rat cage, that we made out of wire mesh, we use pieces of old denim jeans for hammocks, but you could surely use squares of denim for platforms too. Just cut an old pair of jeans into rectangles the width of your cage and, using wire ties slid through small holes in the denim, hang the pieces from the sides of the cage. Alternate the levels so they can hop between them to climb from one level to the next. This isn't going to be a permanent part of the cage because the fabric will be chewed and soiled over time, but it's safe for ratty feet and very comfy to sleep on.... and it recycles old pants so you'll feel good about not throwing out well-loved jeans. We replace our rats' denim hammocks about every three to four months. The rats love when we replace them because they smell freshly like their favorite people!