Gaby
My zoo loves stones! (specially my two kittens, cat seems to be very receptive to stones...). They just love to be in touch with them. I think that their favorite is Sodalite. Historically, seems to be a stone very used to improve comunication between you and your "babies".
Take a look:
http://www.simplestone.com/shop/MAGanimal1.htm
http://www.simplestone.com/shop/MAGanimal.htm
Take a look:
http://www.simplestone.com/shop/MAGanimal1.htm
http://www.simplestone.com/shop/MAGanimal.htm