The wildlife is equally specialized. This is the exclusive territory of the polar bear, the snowy owl, and the narwhal—the "unicorn of the sea." These animals don't just survive the cold; they require it to thrive. A Shifting Frontier

Flip the calendar to winter, and you hit the . In the northernmost settlements, the sun stays below the horizon for weeks. However, it’s rarely pitch black; the snow reflects a deep, ethereal "blue hour" twilight, often topped off by the neon greens and purples of the Aurora Borealis . Life on the Edge

Interestingly, the Arctic Circle isn’t fixed. Because of a slight "wobble" in the Earth's tilt (axial precession), the circle actually moves north by about 45 feet (14.5 meters) every year. If you visit a "Polar Circle" monument today, the actual astronomical line might be a short walk away. Why It Matters