I'm not sure what would be effective for your windows.....the safest thing to do is to keep the mounts away from any direct sunlight or heat (fireplaces, heat registers, etc).
I once saw a mount that was hanging in living room beside a small, tall, but narrow window. You could draw a line down through the center of the mount as the sun completely bleached out all the paint on the eye, part of the nose and all the hair...pretty wild...but definately hit home how strong the sun is and how damaging it can be.
Food for thought.......Marco
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