The breeding population of monarchs is stable, but they’re dying off in droves on their migration South to Mexico.

Monarch butterflies are famous for their annual migrations, but not all migrate. In recent years, more and more monarchs have been living and breeding year-round in California’s Bay Area, thanks in part to the growing presence of non-native milkweeds in urban…

New peer-reviewed research found an average of seven pesticides in each of 10 butterflies tested