Answer to What is This?

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