308 
POPULAE HISTORY OF BIRDS. 
lassidroma, are united into a tube on the top of the upper 
mandible. 
In the Shearwaters {Pztffinus) the beak is lengthened^ 
and the tip of the under mandible is curved downwards ; 
the nostrils are tubular^ but open by two distinct holes. 
The species are fond of congregating, and are often seen 
together in immense numbers. One of these^ the P. cine- 
reus, is found in Europe and on the coasts of South America. 
Mr. Darwin, in his ^JournaF (p. 354), refers to it thus : — 
^^I do not think I ever saw so many birds of any other sort 
together, as I once saw of these behind the island of Chiloe. 
Hundreds of thousands flew in an irregular line for several 
hours in one direction. When part of the flock settled on 
the water the surface was blackened, and a noise proceeded 
from them, as of human beings talking in the distance." 
On examining into the cause of this congregation, Mr. 
Darwin found that the water was coloured in parts by clouds 
of small Crustacea. He shot one, and found in its stomach 
a small fish and seven good^sized prawn-like crabs. 
In some parts of Scotland the young of the Manx 
Shearwater (P. anglonm), another species^ are killed, salted, 
and eaten with potatoes or cabbage"^. 
* Meming's 'British. Animals/ p. 137. 
