{"fact":"New Caledonian crows have a unique bill shape among crows, possibly an adaptation for their sophisticated tool use.","context":"Here, we examine in detail the shape and internal structure of the New Caledonian crow’s bill using Principal Components Analysis and Computed Tomography within a comparative framework. We found that the bill has a combination of interrelated shape and structural features unique within Corvus, and possibly birds generally.","source":"Hiroshi Matsui; Gavin R. Hunt; Katja Oberhofer; Naomichi Ogihara; Kevin J. McGowan; Kumar Mithraratne; Takeshi Yamasaki; Russell D. Gray; Ei-Ichi Izawa, Adaptive bill morphology for enhanced tool manipulation in New Caledonian crows, 10.1038/srep22776","index":421}