[Campbell Biology P.1190] Based on the experiment described involving homing pigeons, which o... | Practice Question

Based on the experiment described involving homing pigeons, which of the following is a valid inference regarding their navigation on an overcast day?

  • A: Homing pigeons exclusively rely on the sun or stars for navigation, making them unable to orient on overcast days.
  • B: The North Star is the primary navigational cue for homing pigeons when solar cues are obscured.
  • C: Homing pigeons possess an ability to sense Earth's magnetic field, which aids in navigation when celestial cues are unavailable.
  • D: Placing a magnet on a pigeon's head enhances its ability to navigate in challenging weather.

Explanation

The text states: 'On an overcast day, placing a small magnet on the head of a homing pigeon prevented it from returning efficiently to its roost. Researchers concluded that pigeons sense their position relative to Earth's magnetic field and can thereby navigate without solar or celestial cues.' This directly supports inference C.