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Studies on the pattern of geographic variation in bird vocalizations can facilitate the understanding of the evolutionary history of species and species differentiation. The Common Cuckoo (Cuculus canorus) is a non-passerine widely distributed in Eurasia, and its calls are not acquired through learning. Revealing the geographic pattern of Common Cuckoo(More)
Soft song is a low-amplitude song produced by many birds. Recent studies have confirmed that soft song is an aggressive signal. For example, the Brownish-flanked Bush Warblers Cettia fortipes use soft song in male-male conflicts, particularly prior to attacks. Although stable signaling systems require that signals be honest on average, models predict that(More)
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