As British butterflies head north, scientists ask public to help track migration

With up to 80% of butterflies in decline, people are being asked to spend 15 minutes to record number and type witnessed

Scientists are calling on the public to help track how British butterflies are moving north as the climate heats up.

Examining 50 years of data, researchers from the wildlife charity Butterfly Conservation, which runs the annual Big Butterfly Count, have identified a clear northerly shift among many species, including the familiar garden favourites the comma, peacock and holly blue.