202 ADDENDA 
them visible from a great distance. Gulls 
are all web-footed birds. Of the above-men- 
tioned the Herring Gull is the largest, length 
24 inches; next the Common Gull, 184 
inches, then the Black-headed Gull, 16 inches, 
and last the little Kittiwake, only 154 inches. 
The Herring Gull follows shoals of herrings, 
hence the name: -It feeds on everything at 
can, including offal and carrion. In summer 
the plumage of the adult bird is much like 
that of the summer plumage of the adult 
common gull (for in winter the colours of 
gulls are darker, and young gulls are brown), 
that is head and body a pure white, wings a 
delicate grey (pale bluish in the common 
gull), but the tips of the wings are black 
edged white, whilst in the common gull the 
white here is patchy, and the tips brownish 
black. The Black-headed Gull has a red 
beak and red legs, and it is also the largest 
of these gulls and the black head, too, is 
distinctive. The adult has the pure white 
gull body, and the grey or _ bluish-grey 
wings, margined with black. In winter the 
