Tom,
Yes maybe, in the case of a doubtful identification but there is a limit to how much we should all be retyping the text of field guides. People do have other things to do. Someone else already provided hints and I could do so too and add some and sometimes I do, but in this case, there are multiple cues available on this series of photos why it is Peregrine Falcon, these are pretty much as described and shown in the various field guides.
Philip
