Beak Grinding Often when birds are about to fall asleep they

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What does this beak opening and closing body language mean? He does it whenever he's about to fall asleep. : r/pigeon

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Beak Grinding Often when birds are about to fall asleep they gently move their upper and lower beaks in a side to side motion which produces a raspy sound. This is

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Beak Grinding Often when birds are about to fall asleep they gently move their upper and lower beaks in a side to side motion which produces a raspy sound. This is

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