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Fig. 6. Representation of a left turn during slow flight in a pigeon Columba
livia, as seen in caudal view (from
Warrick and Dial, 1998). (A)
Roll is initiated using greater velocity on the outside (right) wing during
the first part of downstroke. (B) Roll is arrested using greater velocity on
the inside (left) wing during the latter half of downstroke.