Sorting through the many threats to monarch butterflies
▻https://massivesci.com/notes/monarch-butterflies-migration-climate-change-mexico-threats
Every year monarch butterflies in southern Canada and the north-central United States travel over 4,000 kilometers (2,485 miles) southward. Triggered by cool weather and the slow death of their host plant, milkweed, monarchs make their long journeys to...