When a reader shared this photo asking about some unusually creepy-looking insects, even my 4-H entomology days didn’t prepare me. I was stumped.

Fortunately, Anthony Zukoff, Instructor of Entomology and Insect Diagnostics Program Coordinator for K-State’s Western Kansas Research and Extension Office, had the answer: they’re immature wheel bugs.

“While they are numerous when hatching, they quickly disperse into the environment,” Zukoff explained. “Many will actually be killed by predators or parasites before maturing.”

That’s one reason adult wheel bugs aren’t seen very often. Though they can bite—especially the adults—they aren’t aggressive if left alone, and they’re not venomous.

“Ultimately, they are a positive insect for the local ecosystem,” said Zukoff. “Wheel bugs are great predators and help control many pests.”

He wasn’t kidding. These stealthy insects feed on caterpillars, beetles, true bugs, sawflies, and aphids. Wheel bugs paralyze their prey with a powerful saliva that immobilizes them in about 30 seconds. And if you’re wondering about honey bees—good news. Zukoff noted it’s rare for wheel bugs to catch them.

The photo in question showed freshly hatched wheel bug nymphs just emerging from their egg cluster. Each female lays 40 to 200 eggs at a time, protected by a sticky coating that helps them survive the elements and hungry predators.

While the adults are gray or brownish, the nymphs stand out with their bright red bodies and black legs. It takes about three to four months for them to grow into their mature form.

Because wheel bugs are considered beneficial insects, Zukoff advised against using any control measures. So if you spot these curious creatures in your garden, give them space—and let them handle the pest patrol.