The Collaborative International Dictionary
Peregrine \Per"e*grine\, a. [L. peregrinus. See Pilgrim.]
Foreign; not native; extrinsic or from without; exotic.
[Spelt also pelegrine.] ``Peregrine and preternatural
heat.''
--Bacon.
Peregrine falcon (Zo["o]l.), a courageous and swift falcon ( Falco peregrinus), remarkable for its wide distribution over all the continents. The adult plumage is dark bluish ash on the back, nearly black on the head and cheeks, white beneath, barred with black below the throat. Called also peregrine hawk, duck hawk, game hawk, and great-footed hawk.
Wiktionary
alt. peregrine falcon n. peregrine falcon
Usage examples of "duck hawk".
One day I was in the valley digging tubers and collecting the tiny new dandelion shoots when Frightful saw another duck hawk and flew from my shoulder like a bolt, pulling the leash from my hand as she went.