North America’s biggest cat is a rare sight here, but that might change  Austin Prine knows he saw a cougar run across the Elliott Highway about thirty miles north of Fairbanks last December. Prine, a long-haul trucker who was returning south from Prudhoe Bay, says the cat bounded across the snow-packed road and vanished over a guardrail. He estimates the animal was three years old and weighed about 110 pounds. But it was the three-foot tail that told him it was a cougar. Also known as pumas or mountain lions, cougars are not known to inhabit Alaska. An avid hunter, Prine knows this. But having lived around cougars in eastern Washington, he also knows how to distinguish them from lynx, wolves, or other large mammals. And he believes that cougar reports are increasing in Alaska’s interior, including along the Elliott. When he posted his experience on social media, hundreds of people commented, with…