A North American stem turaco, and the complex biogeographic history of modern birds

Earth’s lower latitudes boast the majority of extant avian species-level and higher-order diversity, with many deeply diverging clades restricted to vestiges of Gondwana. However, palaeontological analyses reveal that many avian crown clades with restricted extant distributions had stem group relatives in very different parts of the world. Our phylogenetic analyses support the enigmatic fossil bird Foro panarium Olson 1992 from the early Eocene...