"I had two "male" gerbils that turned into five (we gave away the others) and they had a two level cage. Peanut, the mother, constantly chewed on the ladder, so we had to throw it away after they all died. A few years later, we decided to get gerbils again and put them in the old cage. But we had no way for them to get to the top level, so we bought this ladder and now the cage is perfect again! I hope Felix and Cecil love their new (but old) cage!"