The best I can tell from my brief research is that the raptor we caught in with the guineas is either a Cooper's Hawk or a Sharp-Shinned Hawk.
You be the judge. If you have another suggestion just let me know.
It was an interesting experience to say the least.
The following two days after we caught this bird and set it free, we accidentally caught three cardinals in the guinea pen too. The female survived but the two males were exterminated by daisy before we could do anything to save them.