Small Bird Cages - Just because your fine-feathered friend is a small bird doesn't mean you can give him a tiny cage. Parakeets (also called budgies), canaries, finches, lovebirds, coves, parrotlets, and cockatiels all need some room to move. For smaller birds, the length of the cage is more important than the height because these little birds fly side to side rather than up and down.
The basic, minimum birdcage size requirements for these small birds is 18L x 24W x 18H inches (though some can go a little smaller) and should have a bar spacing of .5 inch or less. As with all birds, regardless of size, it's best to get a bigger birdcage so they have room to exercise, keeping them healthy and happy.
Medium Bird Cages - Not too small and not too big, your medium sized bird is just right. Cockatiels, conures, weavers, senegals, poicephalus, pionus, jardines, amazons, mini macaws, and cockatoos all need room to move. As a general rule, birds with long tails need a taller cage so they can move around without damaging those stately tail feathers.
The best way to tell if you have the right size of birdcage is to see if your bird has enough room to walk around in it and fully extend his wings. Medium sized birds need cages that are a very minimum of 24L x 24W x 24H with bar spacing between .50 to .75 inch. But no matter how big or little your bird, you need to get the largest birdcage size that will work in your home. Just like us, birds want a place big enough to move around in without bumping into the walls.
Large Bird Cages- Large birds like African greys, amazons, parrots, and macaws are a beautiful, intelligent part of your family. These larger birds need plenty of space to move about, so look for a minimum birdcage size of 36L x 36W x 48H with 1 to 1.5-inch spacing between the bars.
Large or small, it's best to get the biggest cage possible for your bird because to keep them happy and healthy they need a place roomy enough for them to get their exercise. A taller cage is usually better for large birds because instead of flying for exercise, they climb. So while they still need enough space to stretch those wings out, taller is generally better than wider. Climbing birds like parrots need a cage with horizontal bars so they can safely climb up the sides.