Counting birds on farmland habitats in winter: Capsule Perimeter counts underestimate the number of birds using agricultural fields.

Author: Atkinson Philip W.   Fuller Richard A.   Gillings Simon   Vickery Juliet A.  

Publisher: Taylor & Francis Ltd

ISSN: 0006-3657

Source: Bird Study, Vol.53, Iss.3, 2006-11, pp. : 303-309

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