34 ELEMENTS OF ORNITHOLOGY. 
ships in their course, and flying round them at a great 
height with the velocity and directness of a small steam-engine. 
Nevertheless, though they depart far from land they do not do 
so to the extent to which Petrels and the Frigate-bird will go. 
They are gregarious, and nest together on coasts where rocks 
Fig. 33. 

The European Flamingo (Phenicopterus antiquorum). 
and bushes are found in proximity. They have much the appear- 
ance of Terns, but are shorter and somewhat larger. 
We have now noted various Aquatic Birds that are quite 
strange to England, and which are mostly marine, though 
some frequent rivers. We will next pass on to consider 
