This Ant Has 10 Minutes to Hunt Before the Sahara Kills It

Why Would an Ant Hunt in 122°F Heat?

C. bombycina occupies a particular niche in the Sahara that no other forager can access: it is a thermophilic scavenger. Its main nutrition involves collecting the corpses of insects and other small animals that die in the midday heat. 

Plus, the silver ant’s competitors and predators, like lizards and other ants, cannot tolerate the temperatures that kill the silver ant’s prey. By foraging during the hottest part of the day, C. bombycina can eat its fill and live to forage another day.

However, operating at those temperatures requires the ant to solve a physiological problem that most animals simply cannot overcome. How does the Saharan silver ant stay cool and survive long enough to feed?

Why This Ant Is Silver

The Saharan ant’s silver appearance is what allows it to thrive. According to research published in Science, the hairs covering this ant’s head, thorax, and abdomen have a distinctly triangular cross-section, unlike the rounded cross-section typically present in most animal hairs. But why would triangles assist with heat reflection?

In practical terms, these corrugated surfaces act very similarly to prisms, causing light to undergo a process of internal reflection, bouncing away from the body at a rapid pace. The result is an impressive thermal management system, especially in such a small creature. Here’s how it works in greater detail.

In the visible and near-infrared range of light, where solar radiation is most intense, these hairs reflect incoming sunlight away from the body. In the mid-infrared range, where a heated body typically radiates thermal energy, the same hairs enhance the ant’s emissivity, shedding heat outward instead of retaining it. 

In layman’s terms, these triangular hairs reflect light far more efficiently compared to bare cuticle, and no other known biological structure performs this type of thermoregulation across such a broad range of the electromagnetic spectrum simultaneously.

There’s one more physical advantage to note about the Saharan silver ant, especially when it comes to heat: longer legs also elevate the ant’s body above the hottest layer of air (the layer directly in contact with the sand), keeping it cool just long enough to survive.

Heat Shock Proteins: How Saharan Silver Ants Gear Up

Even with reflective hairs and elevated legs, foraging at Saharan sand surface temperatures means this ant’s internal temperature still rises during a run. However, C. bombycina has solved this biochemically: silver ant foragers produce heat shock proteins before they emerge from the nest rather than in response to heat stress. 

Most organisms produce these proteins reactively, as an emergency repair response after encountering damaging heat. The silver ant produces them beforehand, which means they arrive at the sand surface already protected, before any heat is absorbed.

How Fast Do Saharan Silver Ants Move?

Speed is vital to the Saharan silver ant’s overall survival, and for obvious reasons. But just how fast can they run? 

Research reported by the Christian Science Monitor found that C. bombycina sprints at approximately 70 body lengths per second, making it one of the fastest rates relative to body size in any animal. Covering roughly a meter per second, these ants race to their prey, eat what they can, and dash back home. 

Additional research confirms that the ant transitions into a gait at peak velocity where all six legs are briefly airborne simultaneously; this is a movement pattern not previously documented in ants. But of course, there’s a reason for this: if the Saharan silver ant spends more than roughly ten minutes on the surface, the heat will overcome every adaptation the ant has.

Navigation in the Saharan Desert as an Ant

The final question to ask about silver ants is: how do they find their way home in a featureless sea of sand? As if this ant wasn’t remarkable enough, C. bombycina also uses a path integration system, or a sort of internal odometer. Tracking direction and distance continuously, this innate ability allows the ant to compute a direct return route to its nest from any point in its foraging run without retracing its steps. 

An ant that uses solar polarization patterns as a compass and stride count as a distance measure — alongside all its other advantages — makes the Saharan silver ant an endlessly impressive species, regardless of its diminutive size.