How hummingbirds control forward flight

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Anna's hummingbirds steer a course based on the vertical position and size of prominent features.
Video by Charlie Croskery, editing by Roslyn Dakin
Based on research by Roslyn Dakin, Tyee K. Fellows, and Douglas L. Altshuler at the University of British Columbia:
"Visual guidance of forward flight in hummingbirds reveals control based on image features instead of pattern velocity"