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What generates and maintains biological diversity? This major question in evolutionary biology has fascinated scientists for centuries and continues to drive new and exciting research. Explore recent findings that examine avian hybridization in chickadees and wagtails, species boundaries in redpoll finches, and the genetic basis of spatial cognition, to gain a better understanding of divergence and speciation in birds. From the genetic basis of feather color to metabolic pathways that differ between closely related species, this work is helping us better understand what makes species different, and how those differences contribute to the maintenance of avian biodiversity