“It was the most mesmerizing sound that I had ever heard,” David Bolin recalls of listening to wolves howling in Denali National Park. Bolin, a photographer from Black Forest, Colorado, was visiting the iconic Alaska park in September 1995 when he first heard that call of the wild. A decade later, Bolin and his wife were visiting the park again on a snowy January day, and they noticed a group of four or five wolves moving in and out of the woods. The couple spent two or three hours taking pictures of the animals despite the blustery conditions. As the afternoon light was fading, David made this haunting portrait with a long lens attached to his camera.