40 FIELD KEY TO THE LAND BIRDS. 
thing except size, being much larger. He summers 
in the Arctic regions, and comes south to winter in 
the West, being rarely found in the East. 
SHRIKES, — Laniidae, 
——-~. BILL. — Strong, toothed, hooked like 
LEB a hawk’s. 
ad Foop. — Insects, mice, and sparrows. 
29. NORTHERN SHRIKE. BU TCHEE 
BIRD. Lanius borealis. — Length, 10§ inches. Gray 
above ; wing and tail black; outer tail-feathers and 
underparts white, barred finely with gray. Female 
similar, but more strongly barred with gray-brown. 
The Butcher Bird summers in the far North, and 
comes South in winter, following flocks of Juncos and 
snowbirds, on which he feeds. He perches, hawk-hke, 
on telegraph poles and bare branches, waiting for his 
prey. He flies low, close to the ground. 
100. SOUTHERN SHRIKE. LOGGER- 
HEAD. Lanius ludovici inches. 
Bluish gray above, with black on the ear, and in front 
of eye, tail, and wing; underparts white, breast gray- 
ish, but not barred. In his ways similar to the North- 
ern Shrike. A Southern and Western bird, rare in 
the Hast. 
GREENLETS, VIREOS. — Vireonidae. 
me BILL. — Not so wide as it is thick, 
. & hooked at point. 
> Foon. — Insects. 
The Vireos are all tree birds, rarely seen on the 
ground, and summer birds, wintering in the South. 
In size and coloring the Vireos strongly resemble the 
Flycatchers. For distinguishing marks see p. 21. 
