44$ Major W. R. Thompson on the [Ibis, 
Larus marinus. The Greater Black-backed Gull. 
A resident, breeding here. 
Larus fuscus affinis. The British Lesser Black-backed 
Gull. 
A Common resident, breeding here, though less numerous 
than the Herring-Gull. The Herring-Gull and the Lesser 
Black-backed Gull breed here in the same localities and in 
some cases in the same colony, but if one carefully observes 
these birds whilst on their nests, it will be noticed that in 
most cases the Herring-Gull chooses the bare rock or face 
of a cliff, whilst the Black-backed Gull, although nesting 
close at hand, seems to prefer to place its nest amongst 
grass and undergrowth, or on the soil. The Greater Black- 
backed Gull is a solitary individual ; it does not nest in 
colonies, and when possible seems to prefer a small isolated 
rock to itself. 
Larus ridibundus. The Black-headed Gull. 
A few may generally be met with in winter. 
Larus minutus. The Little Gull. 
This Gull is not uncommon during the winter months, 
but it prefers to keep some distance from shore and so is 
not often seen. It appears to be more numerous during 
Rissa tridactyla. The Kittiwake. 
Some usually to be seen during winter, and I have noticed 
one or two throughout the summer, but these are probably 
non-breeding birds. 
Sterna hirundo. The Common Tern. 
Before the war this bird occurred as a bird of passage in 
small numbers, but I did not see it either last year (1919) 
or this spring, which is curious, seeing that a colony breed 
near Guernsey. 
Sterna paradisea. The Arctic Tern. 
These birds were common in Longy Bay and off the coast 
during the first week in September 1920. 
