Island environments have the potential to change evolutionary trajectories of morphological
traits in species relative to their mainland counterparts due to habitat and resource …

Abstract The New World warblers (Parulidae) are a model group for ecological and
evolutionary analyses. However, current phylogenetic relationships across this family are …

The role and the degree to which environment and geographic isolation contribute to
phenotypic diversity has been widely debated. Here, we studied phenotypic variation …

Cryptic species are closely related taxa that are difficult to separate morphologically, but are
reproductively isolated. Here we examine the warbling vireo complex (Vireo gilvus), a …

Sexual dichromatism, a particular type of sexual dimorphism, occurs in several species and
has been associated with sexual selection. In some cases, the differences are so small that …

A survey of recent taxonomic studies of birds that included acoustic trait analyses reveals
that most studies have not archived the sound recordings that support their conclusions …