Marley and Maybelle: Adoptable female, baby guinea pigs in Waterloo, IA. We are a sweet little pair of girls who are about five months old. We were surrendered to the shelter because our owner no longer had time for us. We are still growing so will need a nice big cage to grow into. We are shy and are still getting used to being hand held. Our adoption fee is $20.00 for the pair of us. Make sure you bring something to bring us home in and have lots of treats ready for us!