Table 1. Summary of the mean directions of the bat cluster and results of Rayleigh test for a preferred orientation in different magnetic fields.

Field conditions	No. data	ab (°)	rb	p
GMF	394	25	0.53	<0.001
1/3rd GMF	451	21	0.50	<0.001
1/4th GMF	433	25	0.62	<0.001
1/5th GMF	466	27	0.47	<0.001
Reversed_GMF	454	162	0.52	<0.001
Reversed_1/5th GMF	462	158	0.56	<0.001

GMF: natural geomagnetic field strength.

a_b: the mean direction

r_b: the magnitude of the mean resultant vector

p: a significant level. p<0.05 indicating a preferred direction; p>0.05 indicating random directions.