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![Flight feather - Wikipedia, the free encyclopedia](https://www.iarticlesnet.com/pub/img/site/s_51.jpeg)
Flight feather - Wikipedia, the free encyclopedia
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日期:2024-08-31
Feathers on the alula or bastard wing are not generally considered to be flight feathers in the strict sense; though they are asymmetrical, they lack the length and stiffness of most true flight feathers. However, alula feathers are definitely an aid to s...看更多