On July 21, 2022, the International Union for the Conservation of Nature placed the migratory monarch butterfly on its Red List of threatened species and classified it as endangered. Monarchs migrate across North America each year and are one of the continent’s most widely recognized species. The Conversation asked Oklahoma State University biologist Kristen Baum, who has studied pollinators for more than 25 years, to explain the listing’s implications for the monarch butterfly in the U.S.
