Nice to see some discussion of this. When I saw the Gyrfalcon a week or so ago, it caught and began feeding on what I presumed was a meadowlark. While feeding, it was buzzed by another very similarly sized falcon. The other falcon disappeared almost immediately, so I was unsure of what it was, but assumed it was a Prairie Falcon (though of course couldn't help but wonder that it seemed very similar in size and general pattern/coloration). Good to know that there is definitely a similar size and plumaged Prairie Falcon in the area, chasing other birds for meadowlarks, as well.
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