strange behaviour

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Hazel - the problem chicken - is the black one on the left. They look quite comfy, don't they? Henrietta (on the right) left me an egg not long after this picture was taken. Hazel has not laid me but 4 eggs in the 5 months that I have had her.

 

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Everyday this is where I find Henrietta's egg. How do I break her of this new habit?