Ants Are Running a Moon-Based GPS

A tiny Australian ant has been navigating the dark of night using the moon as a compass, running its own time-corrected calculations to account for the fact that the moon moves nothing like the sun.

Scientists had assumed bull ants, which don't rely primarily on scent navigation, had to wake up before dark and use the day's last light to find their way. A new study shows they navigate well after the sun goes down, using an innate lunar compass.

The moon is a much harder guide to follow than the sun because its rise time, phase and trajectory vary dramatically across the lunar month. While the sun is reliable, the moon is a moving target that changes its schedule every single night.

The team found the ants' behavior was consistent with a time-compensated lunar compass. The insects observe how quickly the moon moves to estimate the relative position of their home, then update that prediction over time. The moon rises slowly, speeds up at its highest point, then slows as it sets. Ants could be badly misled if they don't account for that shift, but researchers found the insects have an internalized sense of the moon's changing speed and compensate for it.

The researchers also tested whether the ants cross-referenced skyline cues to stay on track. They do. A celestial compass backed up by local landmarks, recalibrated within each night. An independent sensory biologist not involved in the study called the findings "paradigm shifting."

Bull ants also have specialized eyes that detect circular patterns of polarized moonlight radiating across the sky, letting them intuit the moon's position even when it's below the horizon. The discovery makes them the first known animals to navigate using this type of compass. Whether other nocturnal species are doing something similar remains an open question.

The moon has been waltzing across the sky for eons. The bull ant has been following its steps.

Read the full story at Phys.org, March 11, 2026

Hot Take: Every high school student asking "when will I use math in real life" should meet Myrmecia midas. This little fellow is doing real-time trajectory extrapolation in the dark with no instruments, no training and no complaints. The bar is set; it's six legs high.