FALCONIDZAE —FALCONINA): FALCONS. 535 
forward to invade the breast (this is the rule in European birds, the exception, though not a 
rare one, in American birds). Tail and its upper coverts regularly and closely barred with 
blackish and ashy-gray, the interspacing best marked on the inner webs, and all the feathers 
narrowly tipped with white or whitish. Primaries all showing uniform blackish on their ex- 
posed surfaces, but on the inner webs seen to be marked with numerous regular and close-set 
spots of white, whitish, or muddy buff, for the most part isolated within the webs, but on the 
Fig. 377. — Peregrine Falcon, or Duck Hawk, } nat. size. (From Brehm.) 
inner primaries and secondaries, and toward the bases of all, becoming or tending to become bars 
reaching the edge of the feather. Bill blue-black; cere and much of base of bill yellow; 
feet yellow; claws blackish. Size very variable; length of a good-sized ?, 19.00; extent 
45.00; wing 14.50; tail 7.00. @ averaging Smaller ; wing 12.50; tail 6.00; a usual range, 
sex not considered, is, wing 11.50-14.00; tail 6.00-8.00; tarsus 1.75-2.10; middle toe 
without claw rather more. Young: Recognizably similar to the adults in general characters ; 
not barred below, but there more or less extensively and heavily streaked lengthwise ; uppe* 
