
I think they are Cornish Rocks
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Sorry for your loss. I would agree that it would be possible that your dead chicken was a meat bird, a cornish cross. Occasionally, these birds are accidentally bought by people thinking they are egg layers. Meat birds are typically meant to be butchered around 6-8 week old, and if they are kept past that time, they can suffer from leg injuries and heart attacks. Can you post a picture of the remaining white chicken? This is a picture of growing cornish cross meatbirds—note the heavy bodies:
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