Here are all of the captions from the slides shown above: The irridescent display feathers of Anna's hummingbird reflect red and ultraviolet light, giving them a hidden dimension of color that is not visible to humans. The main photo represents what birds might see. It's a combination of the ultraviolet and visible light images. Unlike Anna's hummingbird, the ruby throated hummingbird throat feathers do not reflect UV light. The presence or absence of UV reflectance might help hummingbirds recognize their own species. The flamingo also reflects UV light. As with the hummingbird, the combination of red and UV shows up as purple in the main photo. Read the "about" link above for an explanation of how this works. Unlike the flamingo, the red on this blackbird appears dark in the UV photo. The blackbird has different red pigments, which absorb more UV light. The same thing happens with yellow pigments in birds.…