Migratory birds use many natural signals to navigate or find direction Which of these may be general...........

Science Affairs Zoology

Migratory birds use many natural signals to navigate or find direction. Which of these may be generally used by migratory birds in navigation?

1. Apparent changing position of Sun

2. Apparent movement of stars with respect to earth

3. Magnetic field of earth

Select the correct answer using the codes below.

1 and 2 only

2 only

1 and 3 only

1, 2 and 3

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Explanation:

Some migratory birds travel as much as 15000 km to escape the extreme climatic conditions at home. Generally they fly high where the wind flow is helpful and the cold conditions allow them to disperse the heat generated by their flight muscles. It seems that these birds have a built—in sense of direction and know in which direction to travel. Some birds probably use landmarks to guide them. Many birds may be guided by the sun during the day and stars at night. There is some evidence that birds may use the magnetic field of the earth to find direction. They have enhanced sensory perceptions which enable them to track changes in magnetic field and move accordingly