Old bird diseases occur more among free-range hens - Poultry World

Old bird diseases occur more among free-range hens

Parasites on chickens: backyard v commercial - Poultry World

Bird Flu Is Killing Millions of Chickens and Turkeys Across the U.S.

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Caged and cage-free laying hens

What's Bird Flu, Why Is It Killing Chickens, and Should We Be Worried? - Barron's

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Free-range hens 'are least healthy': Chickens more likely to catch disease, get injured or die early than those kept in cages

Cage and free-range supplement each other - Poultry World

Smothering - Laying Hens