Dung Beetle
Coleoptera
What Are They?
If you've ever seen a beetle busily rolling a ball of dung across a path, that's a dung beetle but the specimen in this photo belongs to a different branch of the family entirely. Instead of rolling dung away, "tunneler" dung beetles dig straight down underneath the dung pile and drag pieces of it into an underground burrow. Dung beetles as a whole are an enormous group scientists recognise roughly 7,000 living species worldwide and Kenya alone hosts dozens of them, with one well-studied ranch in Laikipia County turning up 79 different species living side by side.
What Do They Look Like?
This beetle is glossy black and compact, with wing covers etched with neat lengthwise ridges running from front to back. Just behind the head sits a duller, slightly bumpy plate carrying a small horn-like knob, and the front of the head itself is armed with tooth-like points along its edge tools built for digging rather than decoration. The front legs are thick and edged with spines, built like little shovels for excavating soil. In many of these tunneling beetles, only the males grow the impressive horns. In one well-studied relative, big males grow a long horn while small males make do with barely a bump and it turns out size matters here in an unusual way: rather than growing gradually, a male's horn either stays tiny or suddenly becomes long once he crosses a certain body-size threshold, with almost nothing in between.
How Do They Grow Up?
Some of these tunneling beetles go to real lengths as parents. In one genus, the female digs the nest and looks after the developing young packed inside dung balls underground, while the male sticks around to help prepare the burrow and stays with her until she's done laying eggs a level of teamwork that's unusual among beetles, most of which simply lay eggs and leave.
Where Do They Live, and What Do They Eat?
Different dung beetles are surprisingly picky eaters. A big study in a Botswana game reserve found that beetles overwhelmingly preferred pig dung, then cattle dung, then elephant dung, with carrion a distant last choice for most but a few species bucked the trend entirely: one type ate nothing but carrion, while another showed up almost exclusively on elephant dung. That kind of specialisation likely plays out among Kenya's own dung beetle community too, spread across savannas, ranches, and farmland wherever grazing animals leave something behind.
Why Do They Matter?
Dung beetles are nature's clean-up crew. By burying dung underground, they recycle nutrients back into the soil, and in doing so they're also used by scientists as an early-warning system: because they're so sensitive to what's in the dung they eat, a drop in local dung beetle numbers can flag a wider problem including one caused, ironically, by well-meaning livestock medicine.
Any Downsides?
Here's the twist: some of the very drugs farmers use to deworm cattle end up poisoning the dung beetles that later feed on that cattle's dung. These "anti-parasite" medicines pass through into the manure and can suppress dung beetle populations along with the rest of the insects living in it which is why researchers now recommend farmers use these treatments carefully rather than routinely, to avoid quietly wiping out nature's own dung-recycling workforce.
What's the Most Surprising Fact?
Pound for pound, a close relative of this beetle holds a genuine world record: one tested individual pulled 1,141 times its own body weight the equivalent of an average adult hauling around six double-decker buses. Scientists discovered the beetles put that strength to use fighting each other for burrow access, with big, well-fed males using their horns to physically shove rivals out of a tunnel while smaller, weaker males skip the fight altogether and instead rely on sneaking in unnoticed to mate.