This piece was originally published in The Guardian and appears here as part of our Climate Desk collaboration. When caterpillars of a beautiful butterfly were introduced to the tiny island of Sottunga in the Åland archipelago, scientists hoped to study how the emerging butterflies would disperse across the landscape. But researchers did not realize that their introduction of the Glanville fritillary (Melitaea cinxia) would lead to the emergence of three other species, which sprang out of the butterfly like Russian dolls. Some of the caterpillars contained a parasitic wasp, Hyposoter…
