Answer:
To escape the harsh winter conditions of Polar Regions birds travel to warmer places in winter this movement of birds is termed as migration. During migration the birds fly high where wind flow is helpful and the cold conditions allow them to disperse the heat generated by their flight muscles. How these birds travel to the same place year after year is still a mystery. These birds have built-in sense of direction and they know which direction to travel to. Many birds are guided by sun during day and by stars during night. Some ornithologists suggest that the birds may use magnetic field of the earth to find the direction.
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