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Fig. 3. Orientation of young pied flycatchers held in captivity during the time of
their first migration. Results are shown from birds maintained in the magnetic
field of Frankfurt, Germany (left), and birds subjected to a sequence of
magnetic fields approximately matching those that they encounter along the
migratory pathway (right). During the time corresponding to the first leg of
the migration (Leg 1), both groups of birds were significantly oriented toward
the south-southwest, corresponding with the direction that they initially
travel. Only the birds exposed to the magnetically simulated migration,
however, adopted appropriate southeasterly orientation during the time
corresponding to the second leg of the migration (Leg 2). The arrow in the
center of each circle represents the mean angle of the group. Arrows that
extend across the first inner circle (dotted line) denote distributions that
are significantly oriented at P<0.05, whereas those that extend
across the second inner circle (solid line) denote P<0.01.
(Modified from Beck and Wiltschko,
1988; Wiltschko and Wiltschko,
2005.)
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