![]() Are more monarchs overwintering in the southern and coastal regions of the eastern US?. ![]() Other questions to ponder when considering the accuracy of the eastern population estimate: It took decades for searching scientists to find the monarchs’ overwintering grounds…how far-fetched is it that there could still be hidden populations of overwintering monarchs between central Mexico and the southern US? ![]() Scientists measure the population in hectares but one hectare can hold between 10 and 50 million monarchs…that creates a massive margin of error. ![]() So how could this estimate have been so wrong? 124 Million Eastern Monarchs? | Graphic by Journey Northįrom spring 2018 through the fall migration, sightings were way up for the eastern population, including spectators seeing clusters of migrating monarchs in trees….virtually unheard of during the spring migration.
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