Raw, dried beans contain the toxin phytohaemagglutinin (or lectin) which is a natural insecticide that protects the plant, but can be harmful to humans and animals. 

As a result, dried beans should never be eaten raw nor fed to chickens uncooked. 

Consuming these toxins can cause digestive issues including extreme vomiting, diarrhea, and nausea. And consuming as few as three or four beans can result in death in a chicken.

Can Chickens Eat Raw Dried Beans?

No chickens can't eat raw dried beans. 

Raw, dried beans shouldn't ever be given to your chickens unless they are soaked for several hours first. Then the soaking water should be drained, the beans rinsed, and then fully cooked. 

Once cooked and cooled, the beans are fine for chickens to eat. 

The act of sprouting the beans kills the hemaglutin in many varieties of beans, but some, like kidney beans, must be boiled and thoroughly cooked to kill the toxin. 

So to be on the safe side, don't feed any dried beans unless they have been cooked.

Canned beans are fine to feed to chickens because they have already been cooked, but they should be rinsed first to remove as much of the sodium as possible. Canned beans can be high in sodium so they should be fed in moderation.

Fresh green beans, Lima beans, and peas, etc. are all fine for chickens.