For sunbirds, all that shimmers is piping hot. The birds’ flashy, iridescent feathers heat up more than other types of feathers, possibly making it harder to stay cool in hot, sunny conditions. If so, ...
The feathers of a hummingbird, the wings of a butterfly, and the sparkle of an opal are all examples of nature's ability to produce structural, iridescent colors that typically require lab-grade ...
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