The Australian budgerigar is the world's most popular pet, and therefore the world's most popular bird as well. Don highly recommends breeding budgies as a hobby, particularly for kids. As well as being very easy and great fun, it teaches them about basic animal husbandry and introduces them to applied science.An aviary is not the best breeding environment for budgies because they tend to fight, much like humans in an overcrowded house. Don recommended putting your breeding pairs into cabinets. These are a bit like pigeon holes, with one pair to each cabinet. A nesting box is attached to the outside of each cabinet, usually with a hinged lid to allow the owner to check its contents. Budgie cabinets with nest box cost about $60 from pet shops.