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Documents disponibles écrits par cet auteur (3)
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Article
Steven J. Portugal, Auteur ; Campbell P. Murn, Auteur ; Graham R. Martin, AuteurThe visual fields of the Aegypiinae vultures have been shown to be adapted primarily to meet two key perceptual challenges of their obligate carrion-feeding behaviour: scanning the ground and preventing the sun's image falling upon the retina. H[...]
Article
Lewis G. Halsey, Auteur ; Steven J. Portugal, Auteur ; Jennifer A. Smith, Auteur ; Campbell P. Murn, Auteur ; Rory P. Wilson, AuteurMeasuring body movements using accelerometry data loggers is a relatively new technique, the full applicability of which has yet to be tested on volant birds. Our study illustrates the potential of accelerometry for research on large birds by us[...]
Article
Graham R. Martin, Auteur ; Steven J. Portugal, Auteur ; Campbell P. Murn, AuteurThe visual fields of vultures contain a small binocular region and large blind areas above, below and behind the head. Head positions typically adopted by foraging vultures suggest that these visual fields provide comprehensive visual coverage o[...]
