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Pirate-Eye Pigeons Reveal How the Brain Talks to Itself

As a baby bird develops, its body contorts to fit within the confines of its egg . The bird's neck twists so that one side of its head is tucked against its chest. In this position, the bird's left eye remains nestled among sprouting feathers--where it does not receive much light from the outside world--whereas the right eye is pressed up against the eggshell, glimpsing flickers of light and shadow through a veil of calcium carbonate.

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