Speciation may be influenced by geographic variation in animal signals, particularly when those signals are important in reproductive decisions. Here, we describe patterns of geographic variation in the song of rufous-naped ...

The Clarion Wren (Troglodytes tanneri) is a small songbird restricted to Clarion Island, an oceanic island in the Archipelago of Revillagigedo, Mexico. This species lives in open habitats throughout the island, which is ...