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Interspecific agonistic interactions are importantselective factors for maintaining ecological niches ofdifferent species, but their outcome is difficult to predicta priori. Here, we examined the direction and intensity ofinterspecific interactions in an assemblage of small passerinesat a garden feeder, focussing on three finch speciesof various body sizes. We found that large and mediumsizedbirds usually initiated and won agonistic interactionswith smaller species. Also, the frequency of fights increasedwith decreasing differences in body size betweenthe participants. Finally, the probability of engaging in afight increased with the number of birds at the feeder

Who bullies whom at a garden feeder? Interspecific agonistic interactions of small passerines during a cold winter