Baby Indigo cannot navigate without seeing the stars when it's their first time flying. They need to see the sky on a regular basis during their first month in order to see and choose their migratory direction. The axis of rotation of the night sky establishes their north-south frame of reference. They learn the constellations associated with the axis. If the axis is switched, baby Indigo buntings follow the brightest star to navigate even if this migratory paths take longer to get to their final destination.
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