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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.
No, they are considered to be toxic to humans, and cause kidney damage.
yes, they can make your donkey sick or even kill them
No. Mulberry leaves are not at all toxic to chickens. They contain a variety of vitamins and nutrients, and have no anti-nutritional factors or compounds which are toxic to humans or chickens.
The stems and leaves are mildly toxic to humans and will cause gastric distress.
I do not have a pharmacological answer, but I have been raising and breeding horses on a MS. farm for 15 years with magnolia tree with no noticeable affect. I have even seen the horses eating magnolia leaves on occasion, which really surprised me. Magnolia's are non-toxic to dogs, cats, and horses according to ASPCA.
Don't eat iris. It has a irritating resinous compound that is mostly concentrated in the root but the leaves also have it.
I would not risk it - there are plenty of other things to try. Rhubarb contains oxalic acid which is moderately toxic - the leaves are too toxic for humans to eat but we can cope with the quantity in the stems.
I wouldn't recommend it, Avocados contain a substance called persin, although it's harmless for humans who aren't of course allergic, Large amounts can be toxic to dogs, so if you happen to be growing avocados at home, keep your dog away from the plants, Persin is in the leaves, seed and bark as well as in the fruit.
Yes, Bromine is toxic
The forget-me-not is not toxic. The Chinese forget-me-not is mildly toxic.
Phenol is toxic and corrosive.