Bald eagles can live very near peregrines. They form a threat to them. Hawks can also be a minimal threat considering the Peregrine can also kill hawks when provoked. Golden Eagles and Great Horned...
Peregrine Falcons are birds that are the fastest animal, ever to set foot on the earth. Not in flight but when they are diving which is called a "Stoop" which allows them to EXCEL speeds of 290mph!...
A peregrine falcon is not nocturnal, peregrines that are living in or near cities have been seen to hunt in the dark when they have to feed a nest, but this is not common behaviour