284 REPTILES AND BiRDS. 
The most remarkable species of the Sea Gull are the following :— 
The Great Black-backed Gull (Larus maximus, Fig. 103) is_ of 
a pure white, with a black back. It is very common in northern 
Pig. 103.—Black-backed Gull 
>" 
Fig. 104.—Grey Gull. 
regions, and habitually visits the shores of the Atlantic to the coast 
of France. 
The Herring Gull (Larus argentatus) is white, with a blue back. 
It is not so large as the previous bird. It is seen throughout the 
year on the coasts of the Mediterranean and the Atlantic, frequently 
associated with the Common Grey Gull (Fig. 104). 
