VERTEBRATA. 325d 
the Rapacious and Climbing Birds, and whose toes—three 
in front, and one behind—are eminently fitted for perch- 
ing only. The legs 
are slender, and sel- 
dom used for loco- 
motion. 
They are divisible 
into three sections: 
a. The Volitores, re- VW 
markable for their Fie. sid, —White-throated Sparrow (Zonotrichia 
powers of flight. albicollis). United States. 
The wings are long 
and pointed, the 
voice is incapable 
of modulation, and 
the eggs are white. 
Such are the Hum- 
mers, having a long, 
slender bill; and the 
Swifts, Goat -suck- 
ers, and Kingfishers, 
having a short bill 
» Fig. 315.—Redstart (Setophaga ruticilla). Unitea 
and wide gape.’ States. 
6. Clamatores, with 
nothing in common 
but a harsh voice. 
In most, the tarsus is 
enveloped in a row 
of plates, which meet 
behind in a groove, 
and the bill broad, 
and bent down ab-_ Fic. 316.—White-eyed Vireo (Vireo Noveboracensis), 
é United States. 
ruptly at the tip. 
The typical representatives are the Tyrant Fly-catchers. 
c. Oscines, or Songsters, all of whom have a vocal ap- 
