TABLE 1. Relative frequency (%) of prey items in Western Barn Owl pellets sampled along an urban to rural gradient in northeastern Buenos Aires province, central-eastern 
Argentina (see Hercolini 2007 for more detail about the site arrangement along the gradient). Numbers correspond to those in Fig. I. Abbreviations: FNB = food niche breadth, FNBst 
= standardized food niche breadth. 
592 
THE WILSON JOURNAL OF ORNITHOLOGY • Vul. 124. No. 3. September 2012 
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