Native plants are preferable to man-made birdfeeders. Ornithologist Michael Plagens explains why and how to make your bird feeding stations nature friendly. Part 1 of an article explaining iridescence in hummingbird feathers. Hummingbirds are the most colorful birds in the Western Hemisphere across the full spectrum of color including in the ultraviolet range. Bird of the episode: Anna's Hummingbird. Birding hotspot: Atascosa Highlands. Friend of wildlife: Arizona Land and Water Trust.