I thank everyone . I have a few of you agreeing with my suspicions.
They are all 2 years old or less. plenty to eat no signs of disease, vaccinated. 50 or so birds.
I think some of them got into rat poison when they were out. they were actually in my big barn where for the first time, I used those little pellets of poison and not the large cakes.
You cant be too careful enough.
I wanted you to keep an opened mind and see if you came to the same conclusion.
I am always so fearful of this happening, that I thought I might not be thinking objectively about the cause. I will take the next or hopefully the last bird to die to be autopsied.
I am depressed