Nature always surprises us in unexpected ways, and this time it’s about a little creature that seems to have figured out GPS and maps even before humans did as a technology!While satellites, GPS chips, and real-time navigation are technologies we consider pinnacles of human invention. And yet, long before any of that existed, a small insect had already solved one of nature’s trickiest problemsIt likely figured out how to move in a perfectly straight line in the pitch dark of an African night?The dung beetle has been silently doing something extraordinary that scientists once thought only birds, seals, and humans could be capable of.
Dung Beetle
Dung Beetle: Meet the Creature that navigates by using Galaxies as maps
If someone told you that one of Earth’s most sophisticated navigators is a dung-rolling beetle roughly the size of your thumbnail, you’d probably refuse to believe it. But it is indeed true!An international team of biologists led by Dr. Marie Dacke of Lund University, Sweden, discovered that African dung beetles (Scarabaeus satyrus) use the sun, the moon, and the starry sky for orientation. Their findings, published on January in the journal Current Biology, didn’t just add a curious footnote to entomology, they altogether gave a new perspective to what we thought we knew about insect navigation. This is the first time animals have been seen using the Milky Way for orientation, as lead researcher Marie Dacke herself stated.
A straight line out of chaos
A fresh dung heap in the South African savanna is, for a dung beetle, a resource and a battleground. Competition is fierce, and speed is everything. The fastest way to escape rivals is to roll their dung ball in a perfectly straight line; any change of path means lost ground, lost food, and a dimmer shot at reproduction.Dung beetles are known to use celestial compass clues such as the sun, the moon, and the pattern of polarised light formed around these light sources to roll their balls of dung along straight paths, according to Dr. Dacke.
But the puzzle was what happened on moonless nights
Researchers expected the beetles to struggle, but surprisingly, they kept going, arrow-straight, in complete darkness.“Even on clear, moonless nights, many dung beetles still manage to orientate along straight paths,” Dr. Dacke said. “This led us to suspect that the beetles exploit the starry sky for orientation — a feat that had, to our knowledge, never before been demonstrated in an insect.”
The experiment that changed everything
The team set up a circular sand arena on a South African game reserve and tracked the beetles’ movements under varying sky conditions, including moonlit, moonless, and overcast. They then moved the experiment into the Johannesburg Planetarium, where they could control exactly what the beetles saw overhead.The team found that the beetles could orient equally well under a full starlit sky as when only the Milky Way was present. Then, to confirm the results, they put little cardboard hats on the beetles’ heads, blocking their view of the sky — and those beetles simply rolled around aimlessly.The conclusion was that the beetles weren’t using individual stars, but the bright stripe of starlight from the Milky Way as a sort of compass.
