In this Tuesday, June 20, 2017 photo, a sign outside chicken houses near Plumerville, Ark., warns visitors to practice good hygiene near the young birds growing inside. When the chickens are 33 days old, they will be taken to a processing plant for slaughter and packaging. Tyson Foods says it will explore more-humane ways to kill the birds, and also that it is using a third-party to monitor videos from the plant to ensure the animals are treated properly. (AP Photo/Kelly P. Kissel)
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