科学素养与生活应用·英语30篇（1）

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沙漠蚂蚁为何无需地标或GPS即可精准导航

Cataglyphis ants trek hundreds of meters across featureless dunes using only polarized light patterns in the sky.
Their compound eyes detect ultraviolet polarization angles, which shift predictably with sun position throughout the day.
An internal 'celestial compass' integrates this data with step-counting to compute exact return vectors.
Neurobiologists identified specialized neurons in their central complex that encode direction and distance simultaneously.
Even when displaced, they walk straight back toward the nest using path integration—not memory of landmarks.
Experiments with UV filters prove navigation fails only when sky polarization cues are blocked—not when visual landmarks vanish.
This system avoids cumulative error by recalibrating daily using dawn and dusk polarization signatures.
Robotics engineers apply similar algorithms to enable solar-powered drones to navigate deserts autonomously.
Ants also detect magnetic fields weakly, but rely primarily on optical flow and celestial cues for precision.
Studying them helps refine inertial navigation systems used in underground or GPS-denied environments.