![]() Bird wings are complex devices that are highly specialized in generating forces necessary for flight. In order to understand the mechanics of bird flight, it is essential to understand the structure that is responsible for flight: wings. Alexander 2002 Videler 2005 Lentink et al. Our results suggest that the size and shape of the alula can be explained in one allometric landscape defined by wing length and loading in these two closely related families of birds with similar wing shapes.īird flight has fascinated many researchers throughout many centuries, and the mechanics and kinematics of bird flight have been well described and experimentally studied (e.g. We hypothesize that heavier species may benefit from having longer alula if they perform flights with higher attack angles than lighter species, as longer alula would better suppress flow separation at higher attack angles. Combined, these results suggest that the species with high loading potential and long wings exhibit long alula. The aspect ratio of the alula was greater in the species that are relatively heavier in the Sternidae but not in the Laridae. ![]() In the Laridae, the aspect ratio of the alula was smaller in the species that have relatively longer wings, but the pattern was opposite in the Sternidae. ![]() The two families differed in the relationships between body size or wing length and the size or shape of the alula. Laridae birds have generally longer wings and greater loadings than Sternidae birds. In this study, we investigated the relationship between the size and shape of the alula and the features of the wing in the Laridae and Sternidae. ![]() Alula size vary among birds, but how this variation is associated with the function of the alula remains unclear. The alula is a small structure present on the leading edge of bird wings and is known to enhance lift by creating a small vortex at its tip. ![]()
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