Sadly, butterflies and other insects are pinned like this for entomological examination, which requires the wings, antenna, legs etc are fully extended so that

Sadly, butterflies and other insects are pinned like this for entomological examination, which requires the wings, antenna, legs etc are fully extended so that all manner of detail can be seen. Many species are different in minor ways, having reached a very similar body design by evolutionary convergence. Numbers of spines, hairs, scales etc are all enumerated. Once dry, they get very very brittle and you can not spread wings/legs etc in fear of breakage. It sounds strange, but a number of beetles, butterflies and other insects have been discovered that look the same - until you examine some of these esoteric aspects. Genomic analysis is the gold standard in these matters. read a few of these search hits. https://www.google.ca/search?q=entomological+examination+of+similar+species&oq=entomological+examination+of+similar+species&aqs=chrome..69i57.19966j0j8&sourceid=chrome&ie=UTF-8#safe=active&q=entomological+variation+of+similar+species https://www.google.ca/search?q=entomological+examination+of+...