4 
FALCONING. POLYBORUS. 
rather wide, or very long and slender ; coeca extremely 
small. The young, when fledged, generally having the 
lower parts longitudinally streaked. Eggs from two to six, 
ovate, or roundish. Nest on trees, rocks, or the ground. 
GENUS 1. POLYBORUS, Vieill. CARACARA. 
Bill large, high, rather long, much compressed ; cere 
large, covered with hair-like feathers ; upper outline convex 
and declinate to the edge of the cere, then decurved ; edge 
of upper mandible slightly arched and nearly even, tip of 
lower compressed and rounded. Nostrils elliptical, oblique, 
in the anterior part of the cere near the ridge. Eyelids 
and space anterior to the eye denuded, as is the skin over 
the crop. Feet rather long; tarsi anteriorly scutellate, 
sharp-edged and scaly behind ; toes rather long, broadly 
scutellate, the first much shorter than the second ; claws 
long, little curved, that of the middle toe being only slightly 
arched. Wings long, rounded, the third and -fourth quills 
longest, the first five having the inner web cut out. Tail 
rather long, rounded. 
4. 1. Polyborus Braziliensis, Gmel. Brazilian Caracara. — 
Caracara Eagle. 
Plate CL XI. Young. 
Adult with the upper part of the head and nape brownish-black, 
the throat and ear-coverts yellowish- white ; the upper parts finely 
barred with brown and dull white, the rump and tail lighter, the lat- 
ter with a large terminal brown band ; the lower parts similarly barred 
with reddish- white and brown. Young with the upper part of the 
head brown, streaked with dusky, the hind neck and part of the breast 
pale yellowish-red longitudinally variegated with brown ; the middle 
of the back, scapulars, wing-coverts and secondaries dark brown, as 
are the hind part of the breast and the tibise ; the tail nearly as in the 
adult. 
Male, 284, 48. 
Texas and Florida. Resident. 
Caracara Eagle Polyborus vulgaris, Auo. Orn. Biog. v. ii. p. 350 5 v. v. p. 351. 
