The Bonelli's eagle is a medium-sized bird of prey, measuring 65 to 70 cm in length and weighing 1,600 to 2,400 grams. The wingspan is 150 to 170 cm. The upper parts are dark brown, whereas the underside is white with dark streaks. The eyes and feet of the eagle are yellow. The wings are relatively short and rounded. The tail is long and is grey on the upperside and white below. There is a broad terminal black band on the tail. The call is a shrill 'klu-kluklu-kluee' sound.