I just went out to check on my chickens, and I found rhubarb leaves in my run. It seems my sister's friend was eating rhubarb from my vegetable garden and decided to give the leaves to my chickens. I am so mad, why would anyone just give someone elses pets a treat without asking. I know rhubarb leaves are poisonous, it doesn't seem like they ate a lot. Just how toxic is it? Does anyone know?