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Addressing the decline of monarch butterflies (Image 2)

Hundreds of monarchs in flight

Researchers at Michigan State University, studying the decline of monarch butterflies, found that a critical piece of the butterfly’s annual cycle was missing: the fall migration. By focusing on this southerly trek, as well as changing the scale at which winter populations are examined, scientists reveal a wider, more-accurate spectrum of threats that have contributed to the monarch population’s downward trend. [Image 2 of 3 related images. See Image 3.]

Learn more about this research, supported by the National Science Foundation (grants DEB 17-02635 and DEB 17-02179), in the Michigan State University news story When it comes to monarchs, fall migration matters. (Date image taken: unknown; date originally posted to NSF Multimedia Gallery: May 29, 2019)

Credit: Courtesy of Karen Oberhauser/Michigan State University

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