Which mechanism limits bird migratory orientation under overcast skies?

💡 Explanation

Reduced polarized light sensitivity hinders navigation because this compromises their ability to detect patterns in light in the sky. Therefore, orientation is limited using polarized light cues, rather than magnetic or celestial navigation which also provides guidance.

• Which process minimizes energy reserves expenditure during bear hibernation?
• Which risk is exacerbated when a bird experiences a puncture to their abdominal air sac during flight?
• Which risk increases when feather barbules lack sufficient microhook interlocking during avian flight?
• In songbirds, which reproductive outcome occurs with habitat loss disrupting learned vocalization patterns?
• Which developmental impairment results when juvenile hormone remains elevated during a pupal diapause?
• Which effect occurs when a ground squirrel in early hibernation experiences sudden environmental warming involving vasodilation?