Editing Fluorescence (section)

==== Butterflies ====
[[swallowtail butterfly|Swallowtail]] (''Papilio'') butterflies have complex systems for emitting fluorescent light. Their wings contain pigment-infused crystals that provide directed fluorescent light. These crystals function to produce fluorescent light best when they absorb [[radiance]] from sky-blue light (wavelength about 420&nbsp;nm). The wavelengths of light that the butterflies see the best correspond to the absorbance of the crystals in the butterfly's wings. This likely functions to enhance the capacity for signaling.<ref>
{{cite journal
 | pmid = 16293753
 | year = 2005
 | last1 = Vukusic
 | first1 = P
 | title = Directionally controlled fluorescence emission in butterflies
 | journal = Science
 | volume = 310
 | issue = 5751
 | page = 1151
 | last2 = Hooper
 | first2 = I
 | s2cid = 43857104
 | doi = 10.1126/science.1116612
}}</ref>