I wanted to extend the space for my birds to fly. Not wanting to buy a new cage I began to brainstorm on ways to build an extended space.
I built this bird cage for about $10. It slides into the open cage door of the other cage.

Step 1: Materials

2 Wine boxes (the same size or one can be slightly longer. You will use these for the top and bottom) ~Free-$2
2 Cheese Log boxes(can acquire them from whole foods or anyplace selling higher end cheese, arriving early in the morning when they do production or calling the day before for holding. Goat cheese logs or small brie rounds come in "slatted boxes" you will use the slats for the door area) ~ Free
1 Roll of 1/2" hardware cloth(Do not get copper, zinc, or brass it is toxic for the birdies) ~$8
Branch(To block sharp wires at connection point)

Staple Gun
Staples
Hammer
Wire Cutters
Needle-nose Pliers

Step 2: The Cage

1.Unroll wire and press as flat as possible.

2.Pull the ends together so it makes a loose roll and work the bottom edge into the bottom of the (the smaller one if there is a smaller one) wine box. Trim if you need to and work the wire into the edges of the wine box, so it all fits nicely.

3.Use needle-nose pliers to bend wires in to connect.

4.Staple the wire so it is secured to the wine box.

5.Place the branch (Finding a branch with little branches off of it can create a perch for the birds) against the connected section as to block the sharp wires. You can attach with rope, string, zip ties, etc. stay away from glue, anything painted, wire made of copper/brass/zinc.

Step 3: Door

1. Use the wire cutters cut a door out in one of the width sides of the cage. Use the door the your cage as a template, you want the door on your new cage to be slightly bigger than the door on the cage you are connecting it to. You are going to slide the door of the cage into the cut out door on the new cage to connect it.

2. Remove the slats off of the Cheese-Log boxes.

3. Use 4 of the slats to create a flat frame a little smaller than the size of the door you cut. You are creating this wood frame to protect your birds from the sharp corners for the wires. So, when you are making your frame make sure that it is overlapping the wires poking out. Where the edges touch staple an X, hammer it down, flip the frame over and using the hammer bend the staple corners down, Hammer.

4. Repeat #3 and create another flat frame. One will go on the outside and the other on the inside to sandwich the hole. Check them to the cage door you are trying to fit through it.

5. Lay the cage on the ground with the hole facing down. Put one frame under the hole so it will be the one on the outside. Put the other on the inside and line them up.

6. *Make sure the staples you are using aren't longer then the two flat frames width put together.* Staple frames together from the inside. Hammer them down.

Step 4: Removable Top

1. Place the other wine box (if you have a longer one this goes on top). I took one side off mine and cut the side/ broke the side to make it less wide so i can see a little bit more in the top of the cage.

2.You can break one of the sides in half along a grain line by placing it at an angle against the side of the house. Use a Hammer and it a couple times down the middle with as much force as you need. It will fissure along the grain line. rehammer to wine bow using nails u pulled out of slat before.

Step 5: Fitting Cage to Cage

1. Open the door of the cage you are connecting your built cage too.

2. Slide door into the door hole you created

3. Slide cages close together. we weren't too worried about the 1/2" or so space between the cages but we rolled up 2 pieces of cloth and wedged them into the space to block it off.