Monarch butterflies down 26% in Mexico wintering grounds

  • A monarch butterfly seen Aug. 19, 2015, in Vista, Calif. The number of western monarch butterflies wintering along the California coast has plummeted to a new record low, putting the orange-and-black insects closer to extinction, researchers announced Tuesday. (AP Photo/Gregory Bull, File)

MEXICO CITY — The number of monarch butterflies that showed up at their winter resting grounds in central Mexico decreased by about 26% this year, and four times as many trees were lost to illegal logging, drought and other causes, making 2020 a bad year for the butterflies.