Vision Bird Cages have a deep base design that accomodates multiple types of litter. Raised ridges on the inside of base provide air circulation, to help prevent mildew. The Exterior Seed/Water cup access is non invasive, reducing stress to your bird during maintenance. Vison cages have Multi grip perches to help promote circulation and prevent foot problems. Cage detaches from base for fast, and easy maintenance. Visions "no drawer" design simplifies cleaning!