Nice presentation, but no, Parrot skin is far too thin to have any ability to create D3 as it is barely thick enough to hold the internal organs. Add two layers of feathers and Sunlight is greatly filtered even during flight. What skin is exposed is far different in its thickness and structure. Human skin thickness is barely enough thickness to produce a limited amount of D3.
As stated, this is my opinion based on my business, education, readings, and hands-on experiences.
Single panel glass does not fully block out UVB. This is clearly seen by the effects of Sunlight shining in causing a chemical change in colored fabric and wood that results in the loss of brightness of the colors and the resulting warmth that can be felt and seen with temperature rises. And, a step further, a double layer of glass does not fully block out UVB. It is only when a thin lay of film is hung between the outer and inner panels is the 'vast amount' of UVB is eliminated.
Yup, that's exactly what we've got. A house in the middle of a field with zero trees for shade or wind break. We have brand new windows, double pane, designed to block sunlight. The porch is also new, and being 12x24, is nearly as wide as the house and covers all but one window on the south side.
It's had the desired effect of significantly lowering our heating and especially cooling bills.
Ralph's room is in the north west corner, has one window on each side with no curtains. But he hangs out with us in the living room all day, and it's brighter under a shade tree at dusk than in there at noon.
Except for when the sun is exactly at the right spot(if it's not cloudy) between the porch roof and bottom of the windows, for about 20 minutes on one side of the window seat.
It is what it is. Between mid November and March, I'm afraid he won't get enough light.
Not just for vit D, but for mental health.
(I've honestly had my own issues with light in winter. An especially complicated issue since I'm allergic to the sun. Yup. That's a thing. My doctor recommended a uv light designed for this. And I'm aware of the potential dangers of using them.)
If everyone is staunchly against artificial uvb bulbs, then what is a good alternative?
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