Yellowstone National Park, Wyoming
June 4, 8:41 a.m.
Sunrise at 5:40 a.m.
Calls of a pine siskin, with other siskins in the background; here are two of the classic "zipper" calls, and two other calls that sound like a high-pitched American goldfinch.
White-crowned sparrow. Muffled sounds of civilization, in the metropolis of West Yellowstone.
Photo by John Van de Graaff