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In dictating the relative distances between the elbow, shoulder and wrist, avian brachial index (BI = humerus/radius‐ulna length) likely influences wing kinematics and, therefore, might predict extinct avian flight capability. This underpins the hypothesis that non‐neornithine Mesozoic avialans with relatively low BIs (associated with improved flight capabilities) restricted neornithine diversification...
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