No
Yes
By preserving autumn leaves with glycerin, an organic emollient, you can create a wreath that will last for months without drying out. This method will also work with green spring and summer leaves. The process requires some experimentation; some leaves don't take well to the glycerin. But the ones that do will be beautiful and last long enough to make the effort worthwhile. For best results, always cut branches in the cool of the evening, and never use leaves that have been through a frost.
Magnolia
Magnolia
to stop bugs landing on them
The magnolia tree
You can learn how to paint leaves black and preserve them for decorations at http://painting.about.com/od/decorativepainting/qt/preserve-leaves-painting.htm. This site also tells you what you needc to do before you paint the leaves.
yes, they can make your donkey sick or even kill them
I could find no reference to Magnolia of any type being toxic to chickens. I have included a link for you to look at. Poultrysite is a very good link for this type of information.
Magnolias are a group of trees and shrubs some of which bear large flowers.
It depends on the temperature in your area. Most Magnolias will keep their leaves unless there is severe frost.