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My dad has a game hen that was so determined, that after all her eggs but 3 exploded beneath her, and dad took the others (that were also no good) out from under her, and ran her off the nest, she STILL sat the (now empty) nest!! He felt so sorry for her, that he put a dummy under her...
There was another thread I saw on here about a hen that was plucking her feathers while she was brooding. I am pretty sure the reply said they do this to keep the eggs warmer.