Unique safety lock design ensures birds will not run around, letting you do not have to worry about losing your birds. CONSIDERATE DESIGN - With the design of the considerate 4 universal casters, you can put the cage where you want and it will not run to anywhere; The unique latch design is firm and safe, which can prevent the bird from opening the door by themselves and ensure the protection; The perch is designed to fit the size of a bird's feet and the breeding box can be hung on either side of the cage.