[EinNYC]

Certainly looks like a prairie falcon. Peregrines have a much darker facial mask.

[rustbucket]

I don't think it is a prairie falcon. At least, it doesn't match my photos of one.

- The markings on the chest don't match the photos in question.

- The tail does have similar markings to the bird in question but the back doesn't have the many white spots that red-tailed have.

Although not shown in these photos the prairie falcon leg feathers do have dark spots on them.