A pet bird depends upon you to maintain its environment.
Many household objects can be dangerous and sometimes fatal for pet birds.
Natural curiosity, powerful beaks, and the ability to fly can cause harm if birds are not carefully monitored. If you are not at home to monitor the bird, it is best to keep it caged. There are many common household items and activities which are dangerous to pet birds. Windows and mirrors do not appear to be a barrier to birds and they may fly headlong into them. Open doors or windows are an obvious danger.