Scientists have known about them at least since the 1950s, when Jón Eythórsson named them "jökla-mýs," which translates as "glacier mice." They're not actually mice. They're smallish balls of moss, and there are lots of them atop Alaska's Root Glacier. They can also be found on ice in Iceland, Svablard, and even South America, presumably places with just the right conditions, even if we don't know what those conditions are.

The really odd thing about them is that they apparently move in some unexplained way, though no ones has observed them doing so. It's just that repeated visits find them in different places.

And that's not the coolest part. "The whole colony of moss balls, this whole grouping, moves at about the same speeds and in the same directions," geologist Tim Bartholomaus of University of Idaho (UI) tells NPR. "Those speeds and directions can change over the course of weeks."

Bartholomaus, and two colleagues have published their research on glacier mice in Polar Biology.

Mice but not mice

The "glacier mice" nickname has stuck perhaps because glaciologists are so fond of the fuzzy things. They're pillow-like, soft, squeezable objects, comprised of different species of moss. Plus...

A 2012 study surprisingly found entire thriving habitats inside the mice. "I had expected to find some animals, but not so many," said study author and arctic biologist Steve Coulsonto to the New York Times. His research revealed springtails (six-legged insects), tardigrades, (of course), and simple nematode worms. And lots of them: In a single mouse, he found 73 springtails, 200 tardigrades, and 1,000 nematodes.

Co-author of the new, wildlife biologist Sophie Gilbert, also of UI, describes them:

They really do look like little mammals, little mice or chipmunks or rats or something running around on the glacier, although they run in obviously very slow motion."

Clues and an unsolved mystery

His report recounts the efforts made by Bartholomaus and his co-authors, which also include biologist Scott Hotaling of Washington State University, to figure out how the mice are getting around.

The 2012 study had outfitted some mice with accelerometers and confirmed that they do rotate, but that's as far as its authors went into the balls' means of travel.

For Bartholomaus and his cohorts, there were some clues going into this.

For example, occasionally, balls are found perched on a pedestal of ice as seen above, perhaps shading that spot from melting sunlight until it finally melts and the ball rolls away.

Another clue is the intact nature of the healthy moss that serves as each ball's surface — it's a sign that they all have their turn in the sun. Says Gilbert, "These things must actually roll around or else that moss on the bottom would die."

One obvious explanation was quickly ruled out — they're not simply rolling downhill, because many of them were found to be on level surfaces.

For the study, the researchers tagged 30 of the mice with a loop of wire and colored beads that identified each ball. They tracked their position of 54 days in 2009, and again in 2010, 2011, and 2012.

Bartholomaus explains, "By coming back year after year, we could figure out that these individual moss balls were living at least, you know, five, six years and potentially much, much longer."

Although the researchers expect the movements of the balls would be individualized and random, that's not what they found. The balls moved about an inch a day, and together, like a herd of animals.

Also, they periodically changed direction, says Bartholomaus. "When we visited them all, they were all just sort of moving relatively slowly and initially toward the south." However, "Then they all started to speed up and kind of start to deviate toward the west. And then they slowed down again and progressed even farther to the west."

Wind, maybe? Measurements of the dominant winds in the area ruled that out. Sunlight patterns also failed to account for the movement of these packs of mice.

So, what's going on? Admits Barholomaus, "We still don't know. I'm still kind of baffled."

Suggestions

Given scientists' affection for the little balls, other people are also rolling the idea around in their minds. Ruth Mottram of the Danish Meteorological Institute suggests to NPR, "I think that probably the explanation is somewhere in the physics of the energy and the heat around the surface of the glacier, but we haven't quite got there yet."

Another theory put forward is that the moss on a ball's underside grows and pushes it over and forward, cueing up the next moss to begin growing in the same way. If growth rates from ball to ball are similar, this could explain their herd-like movement.

The mystery is reminiscent of the "sailing stones" of Death Valley that perplexed scientists for years unit their secret was revealed: They're pushed around by the wind as they temporarily float on wet melting ground ice.