KEEL-BREASTED BIRDS. 289 
The Shrikes (Zanide) have hawk-like bills, abruptly 
hooked, the upper mandible toothed, and both notched. 
They have a world-wide distribution. 
The great northern shrikes, or butcher-birds (Zancus 
borealis), are about nine inches in length. They. prey upon 
insects, mice, and other birds, and are called butchers 
Fic, 317.—Umbrella-bird. 
from the fact that their surplus. game, birds, etc., are im- 
paled,* while yet living, on thorns, briers, or bushes. They 
are great mimics, and extremely adept at learning notes. 
The nest is placed in trees, the greenish-gray, brown-spot- 
ted eggs being from four to seven in number. 
In the wagtails (AZoracil/id@) the. bill is shorter than the 
head, slender, straight, and notched at the tips. The feet 
are strong, and adapted for walking. They are mostly 
confined to the Eastern Hemisphere ; the name refers ta 
the habit of moving the tail up and down. 
* A tame butcher-bird has been known to impale animals given it 
on a sharp stick supplied for the purpose. 
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