Throughout North America, the species known as the "Dark-eyed Junco" exhibits striking differences in feather color, body size, and behavior from place to place. This variation among "subspecies" and "races" of juncos has caught the attention of biologists interested in diversification, evolution, and speciation--the process by which new species form. Exploring the definition of 'species,' hybridization, and the role of new DNA technology in studying evolution, this segment features footage from junco habitats across the continent. From Dr. Alden Miller in the 1920s, to Dr. Borja Mila, a modern day explorer and ornithologist, join researchers on their quest to understand the riddle of the Junco's evolutionary history.
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