Estonian peasants believed that killing a fire red squirrel would cause one’s own hearth to go cold. In parts of rural Sweden, farmers would leave out small bowls of lingonberry jam in winter, hoping to lure the “fire-sprite squirrel” to their barns, believing it would protect stored grain from lightning strikes.
But here lies the crisis. Climate change has altered wildfire regimes. Fires now burn hotter, larger, and more frequently—often too fast for any animal to escape. In the catastrophic 2021 Siberian taiga fires, an estimated perished, including entire populations of fire reds. Unlike the more numerous common reds, fire red variants are already rare (perhaps 1 in 10,000 individuals). Their genetic niche is being erased. The Gray Invasion and the Fading Ember If fire is a threat, the eastern gray squirrel ( Sciurus carolinensis ) is an apocalypse. Introduced to Europe from North America, grays outcompete reds for food and carry squirrelpox virus—harmless to themselves but 90% fatal to reds. Fire reds, with their higher metabolism and smaller population pockets, are especially vulnerable. fire red squirrels
In summer, these squirrels appear almost , with brilliant ear tufts that glow like lit match heads in dappled sunlight. Come winter, their coats deepen to a rich, burnt sienna—the color of banked coals. Unlike their gray or brown cousins, fire reds seem designed to catch the eye. And that, paradoxically, may be their greatest weakness. Estonian peasants believed that killing a fire red
And so the story continues: the ember does not extinguish. It only waits for the right wind, the right forest, the right shadow, to glow again. “The fire red squirrel is not an animal of comfort,” says old Sami proverb. “It is an animal of survival. Where you see it, the forest still remembers how to burn and how to grow.” Climate change has altered wildfire regimes
Science offers no such magic, but observation reveals a kernel of truth. Fire red squirrels are notably more aggressive and territorial than their duller counterparts. Researchers in the Białowieża Forest of Poland found that redder males won more disputes over food caches and mated more frequently. In effect, the fiery coat signals —a visual warning: I burn bright. Do not test me. A Landscape Shaped by Fire The fire red squirrel’s destiny is intimately tied to wildfire. Unlike the gray squirrels that dominate North American suburbs, fire reds evolved in boreal and mixed forests that experience periodic, low-intensity ground fires. These fires clear undergrowth, stimulate conifer cone production (especially Scots pine and Norway spruce), and create the open, mossy floors where the squirrels love to forage.