122 ELEMENTS OF ORNITHOLOGY. 
Some forty birds known as Drongo Shrikes are fly-catching 
ones which associate in flocks. They are Old-World forms, 
mostly with long, forked tails, whereof the Black Drongo Shrike 
(Buchanga atra) may stand as an example. 
The toothed and powerful beak of the typical Shrikes would 
seem by itself enough to show that such creatures were Birds of 

The Drongo Shrike (Buchanga atra). 
Prey, and we may shortly proceed to notice forms which all 
agree to be Birds of Prey par excellence. Before doing so, how- 
ever, we may note a very curious form—a bird with such a 
hooked and Hawk-like bill that we might be disposed to 
include it in the predaceous set. The creature referred to is the 
Oil-bird (Steatornis caripensis) of the island of Trinidad. But 
this Bird, with so formidable a bill, is said to feed on the fruits 
