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Which Came First: Cavities or Cups?

Some birds nest in cavities, and others prefer an open-cup nest. Even species that are closely related may have different strategies. But why? What makes some species nest one way and some species nest another? Read about the research of two Cornell doctoral students as they delve into the evolutionary history of the old world flycatchers to find an answer, and explore their data with interactive graphs.

Cornell Lab of Ornithology

Cornell Lab of Ornithology