Kirtland's Warbler (Dendroica kirtlandii)

Nathan Leopold was an accomplished ornithologist. He was one of the foremost experts on a rare bird called the Kirtland's Warbler. He gave a presentation about the bird which was turned into an article entitled "The Kirtland's Warbler in its Summer Home" that was published in January 1924 in "The Auk" the prestigious quarterly journal of the American Ornithologists' Union. The Kirtland's Warbler is a federal endangered species. Photo by USFWS: Joel Trick