On a humid summer day in Texas, a man named Mike Foshee was unable to escape the heat—Unexpectedly, his air conditioner stopped working. Instead, a stale smell replaced the cool air, reports The New York Times.

Other electronics in his house mysteriously malfunctioned. Soon after, his television exhibited strange behavior—its screen manically flickered.

When he went to investigate the cause of the disturbance by taking apart the TV, thousands of butterscotch-colored ants poured out. The ants had also invaded his air conditioner.

This wasn’t the only case of ants targeting electronics as the site of their new home. Earlier this week, a Reddit user who goes by the name dontandnever shared this gif in Reddit’s WTF community.

And earlier this year, Reddit user cejotafication posted a photo of a similar infestation in Reddit’s picture community.

Why do ants love electronics? (Besides the obvious—damaging the hardware to cause a bug or two, as Reddit user Gotitaila points out).

Upvoted spoke with University of Texas ant researcher and author of a 2014 study on ant warfare, Edward LeBrun, to shed some light on this mystery.

LeBrun wasn’t able to ID the ant species based on the photos alone, but he says that Rasberry (yes, “Rasberry”) crazy ants—the same species that infested Mike Foshee’s home—are known to nest in electronic equipment.

Discovered in 2002, the native South American ants are an invasive species found in the American southeast.

Lebrun says Rasberry crazy ants nest in pre-existing cavities (instead of digging nests in soil or in rotten wood). Since electronics are essentially “hollow boxes” they make for “nice nest sites.”

He explains:

“They look for gaps that are just the right width to house their brood (eggs, larvae, and pupae). The gap between the screen and the plastic cover on these calculators fits the bill.”

Electronics are not the only places these squatter ants infiltrate—some were spotted inside fire ant mounds. Fire ants, of course, are known to deliver deadly venom—ruling over other ant species in the United States.

Rasberry crazy ants are immune to the toxic sting of the fire ant since they secret formic acid, an anti-venom. In battles, Rasberry crazy ants win about 90 percent of the time over fire ants.

This video by Edward LeBrun shows a battle between the two types of ants.

Scientists say that Rasberry crazy ants will one day take over fire ants in the southeastern United States—which is bad news for computer owners.

But Rasberry crazy ants are not the only ants drawn to electronics.

Rice University evolutionary biologist Scott Solomon explains in Slate:

“Research has shown that some ant species are capable of detecting electromagnetic fields and may even use the Earth’s magnetic field as a directional cue as they search for food or nest sites.”

Of course, we don’t really know if Rasberry ants were the culprits behind the great Reddit calculator invasions of 2015 without more evidence to properly identify the species.

We do, however, know this for sure: