Question

During migration, which one or more of the following do birds use for long-distance navigation?

• A. Celestial cues
• B. Earth's magnetic field
• C. Chemical cues
• D. Polarized light

Hint:

Birds use a combination of environmental cues such as the position of the sun, Earth's magnetic field, and polarized light patterns to navigate during migration.

Answer 1

The Correct Option is A, B, D

Step 1: Understanding bird navigation.
Birds use a variety of navigational cues during long-distance migration. These include:

• Celestial cues: Birds use the position of the sun during the day and stars at night to orient themselves.
• Earth’s magnetic field: Many birds possess magnetoreceptors that allow them to detect the Earth's magnetic field, which helps with orientation and navigation over long distances.
• Polarized light patterns: These patterns in the sky, especially around sunrise and sunset, provide directional information to birds.

Step 2: Explanation of the other options.

• Chemical cues: While birds may use chemical signals for short-range navigation (e.g., homing pigeons returning to nests), they are not the primary means for long-distance migration.
• Primary cues for long-distance migration: Celestial cues, magnetic field detection, and polarized light are well-established mechanisms in avian navigation.

Conclusion: The main factors influencing bird navigation during long-distance migration are:

• Celestial cues
• Earth’s magnetic field
• Polarized light