Butterflies released in Finland contained parasitic wasps – with more wasps inside

Introduction of Glanville fritillary leads to emergence of three new species on to Baltic Sea island

When caterpillars of a beautiful butterfly were introduced on to the tiny island of Sottunga in the Åland archipelago, scientists hoped to study how the emerging butterflies would disperse across the landscape.

, Butterflies released in Finland contained parasitic wasps – with more wasps inside, The Nzuchi Times Guardian

But researchers did not realise that their introduction of the Glanville fritillary (Melitaea cinxia) led to the emergence of three other species on to the Baltic Sea island, which sprang out of the butterfly like Russian dolls.

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