19 
body and head whhe. This species breeds chiefly in the Arctic re- 
gions and more Northern countries of Europe,. A few make their 
nests on the rocky coasts of the Northern parts of Great Britain, and 
many frequent in winter the same quarters. 
HERRING GULL. 
Larus argentatus, B rutin. Le Goeland a manteau gris ou cendre. 
Buff . 
The back and wings blueish ash-coloured, the remainder of the 
body and head white. It is the large Gull which is everywhere seen, 
on the coasts of the British Islands, and is equally common on the 
shores of the Western parts of Europe. 
COMMON GULL. 
Larus canus, Linn. La Mouette a pieds bleus, Temm . 
Smaller than the Herring Gull , but marked on the back and 
wings in a like manner. It is the common Gull of our coasts as well 
as of the other parts of Europe and of the Arctic countries. It is fre- 
quently seen inland, especially on ploughed fields- 
The young of these three species are at first entirely speckled grey. 
Some retain the immature feathers longer than others ; but when per- 
fectly mature, their plumage in summer is free from mixture of co- 
lours, the markings being quite distinct ; in winter, the mature birds 
have always some grey feathers on their heads. 
BLACK-HEADED GULL. 
Larus ridibundus, Linn. La Mouette rieuse, Buff. La Mouette 
rieuse ou a capuchon brun, Temm. 
Immediately adjoining this Den, and opposite the Monkey 
Poles, has been formed a Cage and Pond (21) for 
OTTERS. 
Lutra vulgaris, Erxl. Mustela Lutra, Linn., 
in which these Animals are afforded the opportunity of exhibiting 
their natural mode of taking their prey in the water. 
Eastward from the Otter Cage an Enclosure for Land 
Tortoises (22) has been formed. Among them may be ob- 
served the following species. 
b 2 
