In Search of Hummingbirds

On his quest to see as many hummingbirds as possible, this naturalist travels the full length of the birds’ 9,000-mile range in the Americas, catches a glimpse of the smallest bird in the world, and tracks down species who only have 400 members left. Guest: Jon Dunn, author of "The Glitter in the Green: In Search of Hummingbirds"