moss logically explained by a migratory movement. No Herring Gulls 
re identified in the southern section during this cruise, and a 
s.v rp decline was noted in the central section; An increase was 
noted in the north section. A noticeable decline in the western 
section also suggests that a movement towards the breeding islands 
is occurring. 
Age composition in various sections was again recorded. In 
the north 83% (N=107) of the Herring gulls were adults, while 91% 
(N=19) were adults in the central area. In the eastern half 81% 
(N=98) were adults, and 95% (N=19) were adults in the west. 
Gonad condition on three adult females were slightly advanced 
with the largest ova measuring 3mrn. All had moderate fat and 
moderaxe body molt. The yellowness of the bills on all specimens 
was noticeably brighter than on previous surveys. 
b_ack-legged Kittiwake ( Rissa tridactyla ) 29 
uike the other species of gulls, the Kittiwakes showed a sharp 
decline of numbers. All sightings were in the north section, with 
two thirds being in the eastern half. Adults comprised 91% of the 
birds for which age was determined. In the east 45% (N=18) were 
adults, while in the west 90% (N=10) were adults. 
Rhinoceros Auklet ( Cerorhinca monocerata ) 4 
All sightings were in the northeast portion of the grid. 
Horned Puffin ( Fratercula corniculata) 1 
_ * 
One bird was well observed in the northeast section. 
