Bathing is not only a natural behavior, but it is an activity that many birds enjoy. Most birds love water and they spread their wings, chirp and sing as they bathe.
Give them access to frequent baths in slightly warm or cold water during the day when the temperature is warm.
Do not use soap as it removes natural oils from their feathers and dries up the skin.
Leave a bowl of water in their cage or use a sprayer or the shower to bathe them. Thoroughly wet the bird. You can help pat them dry by wrapping them in a towel.
Biting
One of the most common reasons birds bite is out of fear. Mishandling a bird, poking or making a sudden movement can startle the bird and put on its defensive act.
Birds are sensitive to the changes in the environment- they react negatively to strangers invading their territory, neglect or lack of attention.
Introduce strangers, new pets etc slowly, give the birds time to adjust to them.
Mature birds during their breeding season are prone to unruly behaviour. Leave them alone during those times.
Young ones during their growing period- when they are beginning to learn to use their beaks may nibble on your fingers.
Never react violently when a bird bites you.
Understanding your birds personality, giving them enough attention/ privacy whenever they need it, goes a long way in checking its aggressive behaviour.
Please remember it is illegal to keep any birds in captivity with the only exceptions being lovebirds and blue rock pigeons.