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The capacity for aerial maneuvering shaped the evolution of flying animals.Here we evaluate consequences of aviaian morphology for aerial performance(1,2) by quantifying static stability and control effectiveness of physicalmodels (3) for numerous taxa sampled from within the lineage leading to birds(Paraves, 4). Results of aerodynamic testing are mapped phylogenetically (5-9)to examine how maneuvering characteristics correlate with tail shortening,fore- and hindwing elaboration, and other morphological features (10). In theevolution of the Avialae we observe shifts from static stability to inherentlyunstable aerial planforms; control effectiveness also migrated from tails tothe forewings. These shifts suggest that some degree of aerodynamic control andand capacity for maneuvering preceded the evolution of strong power stroke. Thetiming of shifts also suggests some features normally considered in light ofdevelopment of a power stroke may play important roles in control.

Shifts in stability and control effectiveness during evolution of Paraves support aerial maneuvering hypotheses for flight origins