Spizaetus Vieill., Analyse, p. 24 (1816).
Type, Falco mauduyti Daud.
In this genus the toes are short and stout, the claws long and well curved, the outer toe longer than the inner toe ; the bill is short, rather deep at the base; the culmen compressed and curved throughout with a prominent festoon on the margin of the upper mandible; nostril round; the wings are short and rounded, the fifth longest or the fourth and fifth subequal; the primaries exceed the secondaries by less than the length of the tarsus; the tarsu3 is long and slender, clothed with feathers to the base of the toes ; a crest generally but not always present.
This genus is a forest form represented by species both in Africa and America as well as throughout the Oriental region.
Key to Species.
A.Feathering of tarsus not extending- to division of toes...............S. cirrhatus, p. 85.
B.Feathering of tarsus extending on to base of toes.
a. Large; wing over 400 mm...............S. nipalensis, p. 88.
b. Smaller; wing under 400 mm...............S. alboniger, p. 92.