Neighbour–stranger discrimination by song in the veery, a species with song repertoires

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Abstract
Territorial male veeries (Catharus fuscescens) responded much more to playback of song repertories from strangers than of those from terriorial neighbours. Previous experimental work on species that possess song repertoires has demonstrated only weak neighbour-stranger discrimination. These earlier studies, however, employed only one or two song types, which constituted only a fraction of the repertoires of these species. We used the entire repertoires for playback, these varying from one to three song types. The strong discrimination we demonstrate here is interpreted as evidence that repertoires are not detrimental to recognition by song in veeries. Recordings of song sequences from some individuals consistently evoked a stronger response than did those of others. These differences in response were not related to the number of song types, the number of versions of any one song type, nor to the quality of recording presented.