Title Suggestions For A Parrot Training Book?

@Faith - This is just a super quick summary of feather picking but: first make sure they are plucking and not just molting. Dropping a lot of feathers is often just a heavy molt. Look for feathers that have been bitten off, damaged feathers, bald patches on the bird without pin feathers, etc.

If they are plucking, first take them to an avian vet to rule out any medical issues as these very commonly cause feather picking.

Stress and anxiety can cause it: prolonged fear, not enough food, constantly being chased around, lack of enrichment, location of the cage.

Boredom can cause it. Make sure your birds have plenty of thing to keep them busy including foraging toys, shredding toys, preening toys, time out of their cage. Hang shoe laces up around the cage and rotate toys around regularly. Keep their mind busy with trick training, music, tv.

Try diet changes. Some birds have allergies to certain foods or chemicals in foods. I know of one bird that stopped plucking when fruit was take