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Fig. 1. Still frames of a guinea fowl during an unexpected perturbation. A 0.6 m
long force plate placed at the midpoint of an 8 m long runway rested 8.5 cm
below the runway surface. White tissue paper pulled tightly across the
resulting gap and secured with white masking tape created the appearance of a
uniform surface. The velocity and position of the bird's COM through time
(moving from frame A to frame B) were calculated through integration of the
measured ground reaction forces and used to calculate total COM energy, as
described in Materials and methods.
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