how do birds trace their flights
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Even the nocturnal birds use the position of the sun at sunset to know their position. Nocturnal birds also use the stars. This has been proved by letting birds fly in a planetarium and changing the stars' position. Another tool is the earth's magnetic field (earth's north and south magnetic poles).
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Birds can get compass information from the sun, the stars, and by sensing the earth's magnetic field. They also get information from the position of the setting sun and from landmarks seen during the day. There's even evidence that sense of smell plays a role for many migratory birds.
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