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  • Cowbird moms choosy when selecting foster parents for their young

    Cowbird moms pay attention to the size of eggs in the nests they choose for egg-laying, a new study finds. Inset: Two cowbird eggs in the nest of a northern cardinal, with two (larger) eggs of its own.

    Cowbird moms pay attention to the size of eggs in the nests they choose for egg-laying, a new study finds. Inset: Two cowbird eggs in the nest of a northern cardinal, with two (larger) eggs of its own. 

    Photo by Loren Merrill; Inset photo by Scott Chiavacci

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  • Editor’s notes:

    To reach Loren Merrill, call 805-450-1744; email loren21@illinois.edu.
    The paper “Rates of parasitism, but not allocation of egg resources, vary among and within hosts of a generalist avian brood parasite” is available online and from the U. of I. News Bureau.
    DOI: 10.1007/s00442-017-3870-z