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Monarch butterflies survived a cold snap in Mexico, with early signs of a strong overwintering season, but drought in Oklahoma threatens their spring migration.
Monarch butterflies in western Mexico’s Biosphere Reserve survived a January arctic blast, with scientists reporting the cold front did not reach their overwintering sites.
Though monarchs can withstand temperatures as low as 18°F if dry, moisture during freezing conditions has caused major population drops in past years.
Early reports suggest this year’s overwintering season has been strong, with potentially higher numbers than recent years.
Monarchs are expected to begin migrating north in a few weeks, with arrivals in Oklahoma by early April.
Some butterflies tagged in Oklahoma last fall have already been spotted at the sites.
However, a persistent drought in Oklahoma threatens their return, as rainfall is crucial for the nectar-rich flowers they depend on.
Conservationists urge planting native, nectar-producing plants to support their recovery.
Las mariposas monarca sobrevivieron a una ola de frío en México, con los primeros signos de una fuerte temporada de invernada, pero la sequía en Oklahoma amenaza su migración de primavera.