Firefox

Snow lies blue under the stars on a Lapland fell, and out across the open ground something is running that no one will ever quite catch sight of. Its tail does the work the eye can follow: a low sweep through the crust that throws up a spray of cold sparks, a flick against the bare dwarf birches that scatters light into the branches, and then the glow lifting off the ground and climbing until it hangs across the whole sky in slow green and red curtains. For a long time this was explanation enough. A fox was loose in the north, and it was on fire.

The Finns called it the tulikettu, the firefox, and in the older speech of the northern and eastern parishes the tulirepo or the tulikko. The word they used for the lights themselves still carries the animal inside it. Revontulet, the everyday Finnish name for the aurora, breaks down to revon, an old possessive of repo, the archaic word for fox, and tulet, fires. Fox fires. The modern tongue has swapped repo for kettu and forgotten the reason, but every clear winter night the sky over Finland is still, by its own name, the burning of a fox.

By daylight the firefox is nothing to look at, or so the stories insist, a small dark animal the colour of wet peat, easily mistaken for any common fox slipping between the trees. The change comes with the dark. At night the same coat twinkles and burns, and when the fur is stroked the right way it gives off a strange cold light, as if the heat had been pressed out of it. Brush a hand down its flank in the proper direction and it glitters. Brush it wrong and it stays black.

In Lapland they were specific about how the lights were made. The firefox runs, and as it runs its tail lashes against the snow and the low branches, and every contact strikes sparks the way flint strikes steel. The sparks fly up. Multiplied across miles of fell and a tail that never stops, they become the shifting fire overhead. There is a small, stubborn truth folded into this. Fur dragged across cold dry air does build a charge, and a charge will spark, so the people who watched their own foxes crackle on a January night were not inventing the connection out of nothing. They simply ran it up into the sky.

The tellings differ on the details, as folk explanations do. In some the tail catches the snow crust, in others the scrub branches, in others the rocky flanks of the fells themselves, and each version throws its sparks a little differently. What stays constant is the cold. This is a fire that gives no warmth, struck on a night hard enough to freeze the breath in the air, hanging over country where the sun has gone for weeks. The firefox belongs to that landscape completely. It is the one warm-coloured thing in a world of white and black and star-shot dark, and even its warmth is a trick of the light.

What made the firefox more than a pretty story was what its skin was worth. To take one was the secret wish of every hunter in the north, the kind of luck that ended a man’s poverty for good. The pelt was reckoned beyond price, and there was a practical edge to the legend: a firefox hide was said to glow with a light cold enough to be safe, so it could be hung in a gunpowder store to work by, where a candle or a lamp would have ended the night and the building together. A hunter who brought one home was made for life. The trouble was finding it at all.

The firefox keeps to the far places, the deep woods and the empty country up north, in dens that almost no one has ever stood near. Almost no one ever saw one. It is a creature defined by absence, talked about endlessly and met by nearly nobody, which is its own kind of protection. A thing that cannot be found cannot be caught, and the firefox spent most of its existence being not quite there. The hunters kept dreaming anyway, because the size of the prize made the odds worth ignoring.

Its gifts are strange and largely beautiful. It sets the winter sky alight simply by going about its business. Its hide carries a light that costs nothing and burns nothing, useful in the one place where every other light is a danger. It is fast, half-seen, black when it wants to vanish and bright when it does not, at home in the cold that kills. Its limits are the plain ones of any animal. For all the fire in its name it can be run down and killed by a hunter with enough luck, which is the entire point of wanting it. Its light is not freely given but has to be coaxed out of the fur by a hand that knows the trick. And it is bound to the wild and the dark, never a creature of the hearth or the village, only ever glimpsed at the edge of things and then gone, leaving the sky lit behind it.

Frequently Asked Questions

What is the firefox in Finnish mythology?

The firefox, or tulikettu, is a mythical fox from the folklore of northern and eastern Finland whose tail twinkles with fire. Also called the tulirepo or tulikko, it is said to live in remote dens in the deep woods and the far north, where very few people have ever seen it. It is best known as the folk explanation for the aurora borealis.

How does the firefox create the northern lights?

According to Lapland folklore, the firefox creates the aurora as it runs across the snowy fells, its tail flinging sparks each time it brushes the snow or low branches. Those sparks rise into the sky and become the shifting curtains of light overhead. There is a kernel of physical truth in the idea, since fur dragged through cold dry air really can build a static charge and throw off sparks.

Why did Finnish hunters want to catch the firefox?

The firefox’s pelt was considered immensely valuable, and folklore held that whoever caught one would be rich for the rest of their life. The hide was also said to glow with a cold light, making it safe to use for illumination in places like gunpowder stores where an open flame would be deadly. Catching a firefox was the secret wish of every northern hunter, though almost no one ever managed it.

What does the word “revontulet” mean?

Revontulet, the standard Finnish word for the northern lights, literally means “fox’s fires.” It comes from revon, an archaic possessive form of repo (an old word for fox), combined with tulet, meaning “fires.” The name preserves the ancient belief that the aurora is made by the firefox, even though modern Finnish now uses kettu rather than repo for “fox.”

What does the firefox look like?

The firefox is described as a small, dark fox, pitch-black during the day and easily mistaken for an ordinary fox. At night its coat twinkles and burns, and when its fur is stroked in the right direction it gives off a strange, cold, glittering light. Stroked the wrong way, it simply stays black.

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