Phylogenetic relationships between suitable hosts of the European cuckoo. See Material and methods for sources. Species with species-specific cuckoo egg morphs are shown with two asterisks after the species names, while those with specialized cuckoo eggs for the entire genus are shown with + symbol before the species names.
Soler et al. BMC Evolutionary Biology 2009 9:88 doi:10.1186/1471-2148-9-88