The Cage Riser expands the size of the Bio Bubble and can be used to create habitats for birds or other flying animals. The Cage Riser is constructed with dual doors for exceptional access. Water bottles, food cups, nests, hideaways, toys and perches can be mounted all along the interior or exterior of the riser. The Cage Riser is constructed for durability and a lifetime of trouble-free use. Stack multiple Cage Risers together to create environments suitable for larger birds or mix and match with other available Risers to create a customized habitat.