Sun Bird

This is the first of lame riddles.

Riddle:
One morning, a bird took 10 minutes to fly East from its nest to a fruit tree. But the return trip, it took only 5 minutes. Why??

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When the bird flies East, the sun was too glaring, so it uses one wing to shade its eyes. On the return trip, the sun does not glare into its eyes. It can use both wings, so flies faster and takes only half the time.

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...to here for answer)
:) Have a nice day.