Which navigation cue is determined by patterns in polarized light?

• A. Sun position
• B. Patterns in polarized light
• C. Magnetic fields
• D. Olfactory cues

Answer: (B)

Polarized light patterns in the sky act as a compass that animals can read to determine direction, especially when the sun isn’t visible. When sunlight scatters in the atmosphere, it creates a predictable pattern of polarization across the sky, with the orientation of the polarized light indicating direction relative to the sun. Animals with polarization-sensitive vision can detect that pattern and infer which way they are heading, or adjust their path accordingly. This makes the polarization pattern itself the cue scientists study for navigation. The other cues are different sources of directional information: the sun’s actual position provides a cue when the sun is visible, magnetic fields offer magnetoreception-based directions, and olfactory cues rely on smells.