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> I was wonder why they don't have chickens somewhere

It's probably a bio security thing. If these chickens escape into the wild there's the risk of infecting the local bird life with new diseases or viruses that the local population have no defences against.

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If the chickens escaped, wouldn't they be frozen solid in minutes and effectively biologically inert?

You'd be OK at the pole, but somewhere like McMurdo? It's often mild enough for a chicken to survive in the summer for a while, certainly long enough to interact with local wildlife.

Plus, scavengers would still be an issue with dead birds.

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