| ultraviolet plumage reflectance distinguishes sibling bird species. | realistic studies of plumage color need to consider that many birds can see near-uv light, which normal humans cannot perceive. although previous investigations have revealed that uv-based plumage reflectance is an important component of various intraspecific social signals, the contribution of uv signals to inter-specific divergence and speciation in birds remains largely unexplored. i describe an avian example of an interspecific phenomenon in which related sympatric species that appear simila ... | 2004 | 15546987 |