One of the world’s most iconic migrations is at risk, as rising temperatures alter the quality of vital flower nectar. Every autumn, millions of monarch butterflies embark on a treacherous journey – flying more than 3,000 km from Canadian fields all the way to Mexico’s mountain forests for the winter. For years, the monarch butterfly has shown resilience amid the growing threat of climate change. But now, there’s a new snag in their epic trek – and it’s all down to flower nectar. The study has been used as the focus of a new exhibition titled Flutterings: Monarchs and Climate Change.