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Fig. 6. Velocity fields, revealed using DPIV, of the wake of a baby chukar
Alectoris chukar, 6 d.p.h., which was obviously struggling during
WAIR at 65°. Backgrounds illustrate the bird (A) and vorticity, 
(B). Transparent red loop in A is an assumed 3D shape of vortex ring as
inferred from concentrations of about
and
. Only a starting vortex
() is visible. Compared with
the wake of the baby in Fig.
3A,B (day 7, post-hatching), the wake is less organized and
negative circulation (
) is less
(40.5%).
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