Our neighbors have chickens next to the property line. Two days ago Flower, one of the chickens, died. I was home in the afternoon, and my neighbor Jennie and I discussed over the corpse of the bird what the problem could have been. Both of us Googled unsuccessfully. Today Jennie told me she and her husband Jason had autopsied the hen in their side yard. In the crop of the bird's body they found a mass of wood chips. I remembered we'd chipped branches last weekend and some of the chips had landed in the chicken yard. Several of the hens had begun scratching in the chips immediately. Apparently Flower had eaten some.
We felt terrible and offered to pay for Flower's replacement, but Jennie said no. She'd seen us with the chipper, knew some had gone into the henyard, and done nothing. None of us knew they'd be dangerous for chickens.
We live and learn in our neighborhood.