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vocalizations and use tools make them some of the most intelli-plans and behaviors originate, and how prominent living groups The Dinosaur–Bird Link: Once Controversial, Now Heilmann [10]. Up until the 1960s most scientists held that birdsorigin, early diversification, and rise to dominance of birds, and the various lines of evidence that piece together this story. Note that throughout this review, we use the vernacular term The debate over bird origins was reinvigorated in the 1960s– 1980s, as a new generation of paleontologists spearheaded the ‘Dinosaur Renaissance ’ [11]. John Ostrom discovered fossils‘birds ’ to refer to a specific group, which is defined in a phyloge-netic sense as the most inclusive clade containing Passer domesticus (the house sparrow) but not the extinct bird-like of the astonishingly bird-like dinosaur Deinonychus in western North America [12], Robert Bakker and colleagues argued that dinosaurs grew fast and had active metabolisms like living birdsachieved their diversity over hundreds of millions of years of evo-lution [2,3]. Here, we review what is currently known about th