Find Nature Cluster at PetBird Xpress. Call our friendly customer service representatives at 800-448-2014 if you have any questions. Nature Cluster orders are processed within 1 day. We ship from three warehouses via Fedex and UPS. PetBird Xpress is your source for quality branded products from PLANET. We don't stock any inferior house brands. At PetBird Xpress, your satisfaction is our number 1 concern! We've been at it for over 15 years and we have satified thousands of customers like you.