Fresh drinking water should always be available and should be replaced at least twice a day. You can help keep your bird fit by keeping the cage clean, making sure your parrot has fresh food every day, giving it baths at least twice a week, making sure it isn't bored, and having it checked by a vet at least once a year for parasites or other problems. Feather plucking is a common problem, which may be linked to poor nutrition, not being able to bathe, or boredom. If you have more than one parrot, keep them apart if one appears to be bullying the other. It's very important to quarantine a new arrival if you already have one or more parrots.
Psittacosis is a fairly common infection among parrots, which can be transmitted to humans.
It causes breathing problems and weight loss in parrots, and fever, cough and muscle pain in humans. You need to wash your hands after handling new arrivals, both for your own safety, and that of other parrots. Allow new arrivals time to settle down quietly and get used to their new surroundings. You can leave a low wattage bulb on for the first few nights, so that if any noises startle your new bird, it's less likely to damage itself by fluttering its wings against the bars of the cage. Handling Parrots vary in terms of the strength of their beaks, and some of the larger varieties can cause serious damage to human fingers.