i was reading about pluckers when i saw someone writing that plucking could be lack of uvb uvb rays...saying a bird will preen the oil gland at the base of its tail to release oil....the oil makes vitamin d when exposed to sun light or uva uvb light...then when the bird is preening again it ingests the vitamin d...also i read birds absorb uvb uva through their eyes..saying their eyes also need uvb uva................i read that birds that have low vitamin d (low calcium) can pluck more trying to get at their oil that is supposed contain vitamin d...and the problem gets worse and worse...i'm thinking when a bird is young its very important to expose it to uvb uva light..i don't know if you can help a bird that is already plucking but maybe....feeding foods to the bird high in calcium are also supposed to be good..many lizards need to make their calcium through uv light..lizards can be healthier when they can get uv from light as well as food...my guess is birds that eat whole animals can get a lot of their calcium from their food..while birds like parrots may need to get their calcium from their own oil and through their eyes...anyway...i think i'll put our new gray out on the porch some..i do know our conures love the sun...