Every year, monarch butterflies make their iconic migration across North America. The journey spans thousands of miles and three countries. However, very little is known about this migration, resulting in the lack of concrete data about a very important life stage of these butterflies. Scientists are now using lightweight radio tags to get insights into the mysterious migration of monarch butterflies. Using the technology, they have been able to understand how and where the butterflies move, filling crucial gaps in the data. Watch the latest episode of Then vs Now to learn more.This article was originally published on Mongabay
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