Monarch butterflies

Watch: Tracking the monarchs to Mexico

April 19, 2019

Before the 1970s, where monarch butterflies overwintered was a mystery. Then researchers succeeded worked with Mexicans to trace the migration to the hills of ...

Fall of the monarchs

April 9, 2019

Over the last two decades, the number of monarch butterflies (Danaus plexippus) in North America has plummeted by approximately 90 percent — in part due ...
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