... found that young pigeons had difficulties in both sunny and overcast environments, suggesting that using the earth's magnetic field to navigate is innate, whereas using the sun comes with experience. Mouritsen and Frost looked at Monarch butterflies and the way in which they navigate. They condicted an experiment whereby butterflies were tethered in a specially built flight simulator that simulated flying with the use of airflow from below the butterflies. This, however, did not affect the direction in which the butterflies headed. It was found that the butterflies headed in a south-westerly direction. However, some of the butterflies had their day-night cycle shifted by six hours; some in one direction, other's in the other direction. These butterflies were found to be headed in a different direction to the original butterflies. Their path's were at a 90 degree angle from the path's of the normal butterflies. This suggested that the butterflies headed ...

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