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The Neotropics show a wealth of distributional patterns shared by many co-distributed species. A distinctive pattern is the so-called "circum-Amazonian distribution," which is observed in species that do not occur in Amazonia but rather along a belt of forested habitats spanning south and east of Amazonia, the Andean foothills, and often into the Venezuelan Coastal Range and the Tepuis. Although this pattern is widespread across animals and plants, its underlying biogeographic mechanisms remain poorly understood. The Variable Antshrike (