Hello,
As others stated it helps to have more information. Plucking is a very complex issue. Health issues have to be ruled out first.
Quakers are prone to mutilation of feet, and Plucking. Its called quaker mutilation syndrome. This is partly because of their high intelligence, highly social parrot, and a very active species. Simular to cockatoo.
So they turn to self destruction when their higher needs aren't met.
So a good starting point is to increase time out of the cage to a minimum of 6 hours a day. ( as shared with me by my avian veterinarian , when I took in a rescue and mild plucker, and feet mutilating quaker. We did get her to stop chewing her feet, and not increase plucking, but she still plucks. Even though her home environment and diet and social life are improved...but these are tge best basics to start with after health issues are ruled out)
So I will continue. Increase your interactions time. I spend at least an hour preening each of my 3 quakers feathers. They are highly social live in huge colonies, and the older chick's stay in the parents apartment and help raise the next brood. Least me to believe they need a lot of contact, as has my experience with 4 of them.. Make the diet the best you can, plenty if fresh veggies and leafy greens daily. Increase the birds ability to make self choices, in movement, so keep flighted, in when to take a bath, offer a wide shallow dish ( like a serving dish or glass brownies pan) with about 2 inches if fresh water daily so they. An choose when to bathe. Offer a variety of chewable and stuff they can destroy make an impact on. Yucca chips, those bird bagels, willow balls stuffed with shreds of paper ect. Teach foraging, do foraging together. Set up perches and swings outside the Cage like jungle gym. I use ceiling hooks abd fishing long to hang thing a down above the cage for them to climb, jump, swing on. Really try to maximize their use of the environment.
10 hours of uninterrupted sleep on a strict schedule. Regular bedtime. Mine all have a non fluffy sleep tent. That seems to be a highly debated topic, but has worked for years with mine. You do not have to offer a sleep hut. But I would suggest making available a wide perch higher up in a corner of tge cage with a visual retreat, like hanging a big toy in front of the perch . Thst can help them feel secure when they roost.
Make sure there aren't other pets, people, or something causing them stress. Maybe even something outside.
Always greet them as soon as you wake up. Always let them known when you are leaving, use the same phrase, create ritual. Always greet as soon as you return. This is important to flock, abd let's them feel more in control of the environment. That's advice from a parrot behavior consultant.
All the above us go to for every type of parrot behavior issues. And is the best place to start . Some individuals just have higher needs than others fir activities, and social interactions, and mental stimulated , or are more sensitive to stress.
Because many parrots are forced weaned, or rushed. It causes early food insecurities and stress.. so offering a warm comfort feeding before bedtime for adult parrots can be beneficial. You can use baby burd formula, or offer a spoonful of warm cooked oatmeal, or warm scrambled egg or boiled egg. But fir some parrots this van trigger breeding behavior, so be observant and aware, and stop if thst seems to be the case. Instead offer a non warm and non soft food treat by hand before bed.
I will go and get a good article on stress in parrots and link here.
Its certainly stressful on us to see our burds turn to self destruction behavior.
To put it bluntly, keeping companion parrots is similar to trying to pound a square peg into a round hole. The fact that they do as well as they do is testimony more to their adaptability than it is to our husbandry efforts.
lafeber.com