Are you ready for the answer? It is an alula feather from Darner,
the American kestrel. Here is a photo of that feather, and an alula
from Maxime the bald eagle. Both feathers are used in the same ways by
each bird, but what a difference in size! Thank you to all who checked
in.
This article is an example of how alula feathers are used in flight.
https://www.sciencedaily.com/releas…/2015/…/150605103008.htm
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