Let’s start with the obvious: many beetles are vegetarians. Ladybugs (yes, they’re beetles, not true bugs) chow down on aphids like tiny spotted tanks, but most plant-eaters are less heroic. Japanese beetles, for example, will turn your rose bushes into lace faster than you can say “pesticide.” They’re basically the teenagers of the beetle world—they eat everything green and leave a mess.
But then there’s the dung beetle. Oh, the dung beetle. These guys roll balls of poop around like it’s a precious treasure, and honestly? They’re not wrong. They eat the liquid nutrients from animal dung, and they even use those balls for nesting. It’s gross, but also kind of heroic—imagine cleaning up your neighbor’s backyard every day without complaining. (You’re welcome, planet Earth.)
And don’t forget the fungus-feeders. Some beetles, like the pleasing fungus beetle, only eat mushrooms and mold. They’re the hipsters of the insect kingdom—diet consists entirely of locally-sourced, decomposing fungi. No judgment here, buddy.
The Carnivores: Tiny Terrors
Okay, now for the creepy stuff. Predatory beetles are out there, and they don’t mess around. Tiger beetles, for instance, sprint so fast they literally have to stop to see their prey—their eyes can’t keep up. They eat other insects, including ants, caterpillars, and even other beetles. Imagine running a marathon, but you go blind every few steps. That’s their life.
What Do Beetles Eat? 20 Common Foods They Can’t Resist
Ground beetles are the silent assassins of the garden. They hide under rocks and dirt, then ambush slugs, snails, and cutworms. If you’re a gardener, you should thank them—they’re like free, organic pest control that never asks for coffee breaks. One species, the bombardier beetle, even sprays boiling-hot chemicals from its butt when threatened. So yes, they eat other bugs, but they also fight dirty.
The Wood-and-Textile Devourers
Now, let’s talk about the ones that make homeowners cringe. Wood-boring beetles, like the deathwatch beetle and the powderpost beetle, eat dead wood. They digest cellulose with the help of gut bacteria (again: thanks, microbes). If you hear a ticking sound in your attic walls at night? That might be a deathwatch beetle—seriously, they make tapping noises to attract mates. It’s not a ghost. It’s a timpanist with a wood appetite.
And don’t get me started on carpet beetles. They eat animal fibers—wool, silk, feathers, even dead skin cells. That’s right: your carpet isn’t made of grass, but it might as well be to them. They’re the uninvited guests who show up and eat your sweater from the inside out, leaving you wondering why you ever bought cashmere.
