Decoding a butterfly's travel map: Scientists find globetrotting not in genes

Painted lady butterflies are world travelers. The ones we encounter in Europe fly from Africa to Sweden, ultimately returning to areas north and south of the Sahara. But what determines whether some butterflies travel long distances while others travel short distances? A group of scientists, including from the Institute of Science and Technology Austria (ISTA), shows that the different migration strategies are shaped by environmental conditions rather than being encoded in the butterfly's DNA.