Do you have company, and he feels left out? Is he in his cage with nothing to do? As I said several times, Quakers are very social birds, and do not take kindly to being ignored!
These birds require social interaction on a daily basis, including being let out of their cages, whether it be to play on the top, supervise dinner preparation, or watch TV with you.
If your Quaker is screaming, there is a reason. They are just like human newborns. If a newborn is clear, dry, fed, loved, and provided with adequate visual and environmental stimulation, they will be happy for hours simply lying in a playpen or crib playing by themselves or looking at their surroundings. When they cry, you know something is wrong. Screaming is a manifestation of your Quaker’s unhappiness about something. Determine the cause for the screaming and alter it. When you do this successfully, the screaming will stop.
To be successful in modifying behavior, pay attention to your Quaker when he is good. If you know he is screaming because you left the room, don’t return in the hope that he will stop. True, he is screaming because he cant see you, and once he can (when you re enter the room) he will most likely stop. Unfortunately, dealing with the screaming in this manner will only reinforce to him that “hmmm….screaming will bring someone into the room” So guess what happens every single time you leave the room?
Instead, speak to him form the other room in a calm voice, or whistle to him and encourage him to whistle back, assuring him that you are close by: but wait a few moments after he stops screaming before you reenter the room. Then praise him and give him some attention. This will reinforce that fact that he gets the desired attention when he doesn’t scream, rather than when he does.
Does your Quaker get enough exercise? Lack of exercise can also be a reason for screaming. These are active birds and require exercise as a healthy outlet for aggression. Provide pleny of toys, especially ones that he can swing from and chains or ropes that he can climb. If his wings are clipped, he can still exercise them. Let him perch on your finger, and restrain him with your thumb for safety. Gently lift him into the air, and then bring your arm down. He will flap his wings as if he is trying to fly. All my Quakers loved this game, whether they could actually “fly” or not: and it was great exercise for them.
If all else fails, and you cannot determine a reason for the screaming, maybe he is just stressed out, or overly stimulated: and is vocalizing his frustration. You may want to try covering the cage with a dark cloth, turn off the lights and leave the room. This will usually quiet a bird, because he thinks it is time to go to sleep.
Above all, when training your Quaker remember to do it with love and patience. Impatience and aggravation will only upset your bird and make him nervous, which may lead to biting and mistrust.