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The alula is the freely moving first digit, a bird's "thumb", and typically bears three to five small flight feathers, with the exact number depending on the species. There also are minor covert feathers overlying the flight feathers.
The presence of alula and a complete set of aerodynamic asymmetric feathers arranged forming a modern wing, [10] indicate well develop flight capabilities, as in many other enantiornithean taxa. [6] Its hindlimb morphology remain uncertain as no material of this kind referable to the genus has been found to date.
However, alula feathers are definitely an aid to slow flight. These feathers—which are attached to the bird's "thumb" and normally lie flush against the anterior edge of the wing—function in the same way as the slats on an airplane wing, allowing the wing to achieve a higher than normal angle of attack – and thus lift – without ...
Alula typically bear three to five small flight feathers, with the exact number depending on the species. The bastard wing normally lies flush against the anterior edge of the wing proper, but can be raised to function in similar manner to the slats of airplane wings that aid in lift by allowing a higher than normal angle of attack .
This page was last edited on 22 August 2021, at 17:00 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...
Worse yet, she suddenly molted all at once, losing all of her flight feathers, many of which had coloration that indicated what a sick bird she truly was. Losing all your flight features at once ...
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The preserved wings show variations in feather pigment and prove that Enantiornithes had fully modern feathers, including barbs, barbules, and hooklets, and a modern arrangement of wing feather including long flight feathers, short coverts, a large alula and an undercoat of down. [18]