Small bird cages are for birds like Finch, Canary, Parrotlet, Parakeet, and Lovebird. A rule of thumb is to have enough room for 1-1/2 times the wingspan. Another line of thought is to buy a big as you can afford, the large bird cage is better for the bird.  It is important the bird can move around the cage and excercise. The tail fathers should not touch the bottom of the cage. 

The cage should be safe, yet comfortable, for your bird. It should promote natural instincts such as to fly or climb. Also, features or bird cage accessories that make cage maintenance easier will allow you to spend more time with your bird.  There should be plenty of room for food, water and treat dishes along with a bath. Don’t forget the bird needs plenty of toys and supplies to encourge exercise for good health. Play also stimulates instincts and intelligence. But you don’t want the bird to feel that he/she is just lost in all the bird cage supplies.

The bars should prevent escape or injury but still encourage instinctive activities, such as climbing, flying, or play. Small bird cages should have a bar spacing of no more than 5/8 inches. Inappropriate spacing can result in injury to your bird.  Large doors will provide easy access to your pet and let you conveniently clean and refill the feeder cups. A removable tray will make cleaning easier.