Species limits of the cave swiftlets  (Collocalia) in Micronesia


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Cave swiftlets (Collocalia) from the Mariana, Caroline, and Palau islands build different types of nests and differ morphologicaIIy from each other and from C. vanikorensis. Populations from the three respective island groups are here considered specificalIy distinct from C. vanikorensis and each represent the following separate species: bartschi, inquieta, and pelewensis.