The Squirrel Tree Home was special. Building this item enables you to decorate your pet house's outdoor Yard. Once this item is built, you can place decorative items in your pet's yard. This item can be used as one of those decorations. Building this item required you to send requests directly to 6 friends for materials. You needed to request 2 Acorns, 2 Oaks, and 2 Roofs. As with other collaborative materials, these building materials are not put in your inventory, nor are they deducted from your inventory when you send them.