We recently lost three hens that up until the time they died looked and acted perfectly healthy. The only thing I can come up with is my DH sprayed RoundUp under the grapevines. (unknown to me) The hens are free ranged. The first two died about a week after he sprayed and the third just a day after she started free ranging. ( three other birds are still alive and well) My question, does anyone have any documented ( or personal experience) with RoundUp being lethal to chickens? Yes I have googled it but cannot find anything concrete.