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Fig. 2. The instantaneous horizontal speed (U; calculated from the
displacement of point 11 in Fig.
1B) of the great cormorant during an average paddling cycle. Each
symbol represents the instantaneous speed of one bird (mean of five runs). The
solid line (black squares) is the mean of all birds (N=9). The
acceleration of the body (power phase) occurs during most of the stroke phase
(first six fields) followed by a deceleration until the next stroke phase. The
X axis is the proportion of the cycle duration normalized by dividing
the period of each phase (stroke, glide and recovery) by the mean duration of
that phase (see text).