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    Visual guidance of forward flight in hummingbirds reveals control based on image features instead of pattern velocity
    Roslyn Dakin, Tyee K. Fellows, and Douglas L. Altshuler
    PNAS August 2, 2016 113 (31) 8849-8854; first published July 18, 2016. https://doi.org/10.1073/pnas.1603221113
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