پرهای سرخابی درخشان مرغ مگس خوار به لایه میانی پنهان بستگی دارد

A hummingbird's brilliant magenta feathers depend on a hidden middle layer

The brilliant magenta feathers on the head and throat of a male Anna's hummingbird present an optical puzzle. Magenta cannot be produced by a single wavelength of light. Instead, the feathers reflect a mixture of red and blue. Scientists understood the strong red reflection, but the weaker blue component was harder to explain.