Charming

Birds eat a varied diet in the wild so you should try to provide a combination of both a high quality commercial food suitable for the species and some natural foods such as fresh fruit vegetables seeding grasses native flowers and green foods.
Feed should be completely changed regularly rather than topped up. A cuttlefish bone in your bird's cage will provide important trace minerals. Mixed grit and a source of calcium should be available for those bird species requiring it.
Ensure fresh clean water is available at all times at a temperature and quality that meets the birds' physiological needs and that the bird will drink. Water should be changed daily and placed as high as possible to prevent the water getting dirty.
Do not feed your bird avocado coffee garlic onion or chocolate as these are highly toxic to birds among other substances.
Some birds such as budgies are highly social and it is better to keep at least two birds together. All birds will appreciate toys such as ladders bells swings and mirrors to alleviate the boredom of being in a cage. Wooden chew toys designed for birds will help keep beaks trimmed.

The minimum width of a cage for a pair of birds should be three times their combined wing span.
The minimum length of a cage should permit at least two wing beats (the more the better) between perches. Perches should be placed far enough from the ends of the cage to allow the birds to turn around on the perches without scraping their tail feathers against the cage.
The minimum height of a cage should be three times the length from head to tip of tail of the largest bird to be confined in it and should be increased accordingly if more than one pair or more than one species is kept in the cage.
The cage should be constructed or positioned such that at least one perch is at standing shoulder height (for the sense of security of the birds).
The cage should provide room for the bird to fly between perches in an approximately horizontal plane.
There should be sufficient room for the bird to fully extend its wings and to fly without damaging wings or feathers on the walls or ceiling of the cage.