Outdoor bird cages are usually used by bird breeders and are called aviaries. These are actually large sized bird houses, designed to house the birds outdoors. Outdoor cages can be different depending on the climate you live in. In warm climate the outdoor cages remind more of the indoor ones. They are made from stainless steel or wooden bars and have different bird accessories inside. The space between the bars is rather small in order not to allow predators to come in. Such cages are the easiest to clean and allow the birds to feel as close to the nature as possible.
Large outdoor bird cages, designed to house the bird during cold seasons, are often made from wood and glass. A wooden carcass is build in order to hold the glass walls and roof. Such bird houses can stay warm in the winter while providing the birds enough view of the environment outside. These bird cages must have a good ventilation system in order to keep the air fresh. At the same time they are harder to clean and are often less appreciated by the birds than the cages which allow a lot of air flow.
Outdoor bird cage plans can be found on the Internet. However, it is a better idea to ask for professional help while building a large outdoor aviary. This is a serious project that requires a lot of experience. A small outdoor cage can be designed on your own without a problem. All you need to do is learn how to wield the special instruments. The best way to start is to choose a plan for a small outdoor wooden aviary and then go from there. Large aviaries should be made by professionals regardless the materials. Outdoor cages are a great way to let your pet birds breathe some fresh air without being afraid of it flying away.