The mystery will be solved under the cut.
Actually it isn’t that hard. First you should buy a good book about bird of prey and owls. Compare the color of your feather with the color of the birds in the book. With this guidance you often find the correct bird. But pay attention, even an eagle owl could be black sometimes (rarely). Two little details will let you know if it’s an owl feather or not...
As an example I took a feather of a buzzard. Look at it, its surface is smooth and flat. Aside of the fluff by the quill, the edges are not frayed.
|Common buzzard feather.|
|Barn owl feather.|
I hope, this little tutorial will help you.
Please note, in some countries it’s illegal to collect or pick up feathers of owls and bird of prey. So inform yourself on what you collect.
|Just for fun: Macro photo of the buzzard feather :)|