An analysis on feathered specimens supports the long-debated idea that tropical species look splashier than the rest.
The study covered tanagers and other dazzling male and female songbirds housed in the Natural History Museum at Tring.While writing of their 19th-century voyages to document the world’s biodiversity, European naturalists like Charles Darwin and Alfred Russel Wallace were struck by the appearance of the plants and animals they encountered in the tropics.
The color gradient that Darwin and his peers proposed has remained “shrouded in uncertainty,” Cooney says, for several reasons. Most prior studies have focused on limited geographic regions and used subjective measures of colorfulness, he and his collaborators wrote in the new paper. Miller points out that the inclusion of UV makes the analysis more complete. “They can do a better job of describing what birds can see in that way rather than just what we see,” he says.
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