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  • Report: Milkweed losses may not fully explain monarch butterfly declines

    Monarch caterpillars feed exclusively on milkweeds, while adults consume the nectar of milkweeds and many other flowering species.

    Monarch caterpillars feed exclusively on milkweeds, while the adult butterflies consume the nectar of milkweeds and many other flowering species.

    Photos by Michael Jeffords and Susan Post

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  • Editor’s notes:
    To reach David Zaya, call 217-244-1946; email dzaya1@illinois.edu.
    To reach Greg Spyreas, call 217-300-4023; email spyreas@illinois.edu
    To reach Ian Pearse, call 970-226-9145; email ipearse@usgs.gov.   

    The paper “Long-term trends in Midwestern milkweed abundances and their relevance to monarch butterfly declines” is available online and from the U. of I. News Bureau.
    DOI: 10.1093/biosci/biw186

    The dataset associated with the paper is available online from the Illinois Data Bank.