Description 10-14" (25-36 cm). W. 21" (53 cm). A jay-sized, fast-flying hawk with a long, narrow, square-tipped tail and short rounded wings. Adult slate-gray above, pale below, with fine rust-colored barring. Immature birds brown above with whitish spots, creamy white below with streaks on breast, barring on flanks. Cooper's Hawk is bigger, with proportionately larger head and more rounded tail tip; flies with slower wingbeats.