My chickens are pulling their feathers off

Why are my chickens plucking their feathers out. I'll explain why this happens and what to do about it.

Affiliate links below click
Deluxe Plastic Nesting Box: https://amzn.to/3KUJJrG
Grub Terra soldier fly treats: https://bit.ly/3hMagJS
Duncans Poultry 50 LB Space Saver Wall Feeder: https://amzn.to/37FB8Yy
Duncans Poultry 30 LB Space Saver Wall Feeder: https://amzn.to/34F9IQx
Best Nest Box Rollaway Community Nest Box: https://amzn.to/2WKHJKX

Products we use on the homestead below (Affiliate)

Raising poultry
Grub Terra soldier fly treats: https://bit.ly/3hMagJS
Duncans Poultry 50 LB Space Saver Wall Feeder: https://amzn.to/37FB8Yy
Duncans Poultry 30 LB Space Saver Wall Feeder: https://amzn.to/34F9IQx
Best Nest Box Rollaway Community Nest Box: https://amzn.to/2WKHJKX
Premier PoultryNet Plus - White, Double Spike, 48" H x 100'L: https://amzn.to/2TfjKBJ
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Electric Net Gate: https://amzn.to/2GvwDo3
5 gallon Little Giant Plastic Poultry Waterer: https://amzn.to/3l1srMt
3 gallon Little Giant Plastic Poultry Waterer: https://amzn.to/2JCoqQB
Premier Solar IntelliShock 30 Fence Energizer Kit: https://amzn.to/3mUNznT
Chicken run 10' x 26': https://amzn.to/355WHjE

Harvest Right freeze dryer and accessories: https://affiliates.harvestright.com/839.html
Tray Stackers for Harvest Right Freeze Dryer Trays: https://amzn.to/3kNfet6
Chamber Vacuum Sealer: https://amzn.to/2RFyDjR

Greenhouse and garden
Metal Raised Garden Bed: https://amzn.to/31PupXB
Azomite Pelletized Trace Minerals, 10 lbs: https://amzn.to/3nMfMyM
Azomite Pelletized Trace Minerals, 44 lbs: https://amzn.to/3dnDQD3
Gorilla Carts 4 Cu. Steel Utility Cart: https://amzn.to/34PBMQC
Gorilla Carts Extra Heavy-Duty Poly Dump Cart: https://amzn.to/34V6szI
DeWitt SBLT6300 Ground Cover weed barrier: https://amzn.to/2H3cAOo
DeWitt SBLT4300 Ground Cover Weed Barrier: https://amzn.to/3lK36qh
Dewitt SBLT3300 Ground Cover Weed Barrier: https://amzn.to/2SOnU3l
Dewitt weed barrier cloth 3'x300' or 4'x300': https://amzn.to/3jlXly0
Galvanized 6 inches long Landscape Staples: https://amzn.to/312ormL
Galvanized Landscape Staples (chose quantity): https://amzn.to/3cSMcTa
Liquid Copper Fungicide: https://amzn.to/38fnJXN
10”x20” Grow trays: https://amzn.to/3pjmjlg
72 cell propagation insert Trays: https://amzn.to/36k7pCF
Square Nursery Pots, Case of 60: https://amzn.to/2JNapQi
Barrina LED Grow Lights: https://amzn.to/35bFVQi
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Plant Labels with 2 Gel Pen: https://amzn.to/3n1djz6

Soft wheat flour and pasta machine
Antimo Caputo 00 Pizzeria Flour 55 Lb: https://amzn.to/3oLuBlI
Antimo Caputo 00 Pizzeria Flour 11 LB Bag: https://amzn.to/383JIka
Mulino Caputo 00 Pizzeria Flour - 1-kilo bag (Pack of 4) https://amzn.to/35VyjR8
Antimo Caputo 00 Chef's Flour 2.2 LB 1kg: https://amzn.to/2HTa65E
Molino Grassi USDA Organic Italian "00" Soft Wheat Flour - 2.2 lb (2 Pack) https://amzn.to/35SeeL8
Pasta Machine, Made in Italy: https://amzn.to/34RvHV5
Pasta Maker Machine less expensive with good reviews: https://amzn.to/38a1lir

Food storage long term
Harvest Right freeze dryer: https://affiliates.harvestright.com/839.html
Hamilton Beach Commercial HVC254: https://amzn.to/2G15byy
Hamilton Beach Commercial HVC305: https://amzn.to/3i1zjH8
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Commercial Food Dehydrator Machine: https://amzn.to/3l33aS1
Commercial 320W Electric Meat Slicer: https://amzn.to/3n3kzKP
Vegetable Chopper: https://amzn.to/3wAEaXI
Mandoline adjustable slicer: https://amzn.to/3uqwbuP
Chamber Vacuum Sealer: https://amzn.to/2RFyDjR

Products around the homestead
Security Flood Light with Mounting Arm: https://amzn.to/3n6HaGC
Cut Resistant Gloves: https://amzn.to/3ltcdf5