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First published online July 20, 2006
Journal of Experimental Biology 209, 2888-2892 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02313
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Having the nerve to home: trigeminal magnetoreceptor versus olfactory mediation of homing in pigeons

A. Gagliardo1, P. Ioalè1, M. Savini1 and J. M. Wild2,*

1 Dipartimento di Biologia, University of Pisa, Via Volta 6, Pisa, Italy
2 Department of Anatomy, Faculty of Medical and Health Sciences, University of Auckland, PB 92019, Auckland, New Zealand


Figure 1
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  		Fig. 1. Pooled distributions representing the initial orientation of the three experimental groups: SS, sham operated control pigeons; V1, pigeons subjected to the resection of the ophthalmic branch of the trigeminal nerve; ON, pigeons subjected to the resection of the olfactory nerve. The pooled distributions (mean vector direction, {alpha}, and mean vector length, r) were obtained by setting the home direction (H) to 360°. Each symbol represents the vanishing bearing of a single bird. The open and the filled dots represent the birds released from Bolgheri and Marinella, respectively. The outer arrow indicates the home direction, the inner arrow represents the distribution's mean vector. The inner lines delimitate the 95% confidence interval of the distribution.

 

Figure 2
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  		Fig. 2. Pooled homing performance of the three experimental groups (see Fig. 1). For the birds that homed on the same day of the test release, homing speeds are reported. Birds that homed on the second day, later and lost are also indicated. Open and the filled triangles represent birds released from Bolgheri and Marinella, respectively.

 

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© The Company of Biologists Ltd 2006