Pachyrrhynchus congestus,一种格外靓仔的象甲。它的翅膀上,几丁质构成了3D的光学晶体网状结构,因此产生出彩虹般的过渡色效果。
图1,来源:DOI:10.1002/smll.201802328
图2,来源:Flickr,作者:Javier Rupérez
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