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Are monarchs endangered? Scientists debate as United States mulls protection
Jan. 8, 2021 , 3:00 PM
Last month, the U.S. Fish and Wildlife Service (FWS) declared that one of North America’s best known butterflies, the monarch, might be in trouble. But the agency put off protecting the insect under the federal Endangered Species Act. In the meantime, researchers are continuing to debate how best to gauge the health of monarch populations.
In recent months dueling preprints and publications have intensified the debate. In one camp: researchers who have documented drastic declines in the number of monarchs in Mexico and other areas where some butterflies spend the winter. They believe the species needs immediate help, particularly by protecting and expanding the milkweed-filled meadows where its larvae feed. In another: scientists who have tallied butterfly numbers in areas they occupy during the warmer months and concluded there is less cause for alarm. As a species, monarchs “d