Fig. 1. Circular diagram of the vanishing bearings of the control (filled circles)
and clock-shift (open circles) groups released 9.95 km from home in Oxford,
UK. Birds were released individually and followed through binoculars until
they vanished from sight. Bearings at vanishing were recorded for each bird.
The mean bearings and vectors are shown in the diagram as the arrows in the
inner circle (filled arrow, control; open arrow, clock shift). r is
the mean vector length, and is the mean vanishing bearing. The edge of
the inner circle represents a vector length of 1. The single-headed arrow
represents the home direction (H), and the double-headed arrow represents the
predicted home direction for clock-shifted birds (CS). Reproduced from Holland
(1998).
Fig. 2. Circular diagram of the vanishing bearings of the control (filled circles)
and clock-shift (open circles) groups released 2.3 km from home in Oxford, UK.
Methods and interpretation are as for Fig.
1. Reproduced from Holland
(1998).
is the mean vanishing bearing. The edge of
the inner circle represents a vector length of 1. The single-headed arrow
represents the home direction (H), and the double-headed arrow represents the
predicted home direction for clock-shifted birds (CS). Reproduced from Holland
(1998
