Ok, I have just joined this forum today...just a couple minutes ago actually! I am NOT a guinea pig owner, but am wanting to become one. I first wanted to research everything there was to know. I was also discouraged by the pet store housing for guinea pigs. They all just seemed so small!! (poor little things) Anyway, after I found this site I just have to build one of these cages! My question is (now don't laugh!) will the guinea pig jump or climb out of an open cage?? I am a hamster owner now and I guess I was sort of comparing the two! Thanks for your help!!