Kestrels are the smallest falcons. A friend of mine has some that nest in one of his barns. I enjoy watching them torment Cooper's hawks. The kestrels are much faster and more agile flyers.
Keith
Only in America back before birds of prey were protected I had a falconet that was about 6 inches and a really neat pet the guy I got it from had ordered it out of the back of some magazine without telling his parents about it and they would not let him keep it when they found out they made him give it away