would have recorded these as diurnal birds. The only night when birds 
were relatively numerous and constantly about the ship was on 10 
October in very rainy and overcast weather. At this time the birds were 
attracted to the ship's lights. Excluding the large flock of birds just 
after sunset, the greatest numbers were observed during the fifth and 
sixth hour after sunset. This is consistent with previous findings. 
(See Table VII.) 
TABLE VI 
NOCTURNAL ABUNDANCE OF BIRDS WITHIN THE NORTHERN GRID 
Species _ 
Sooty/Slender-billed Shearwater 
Wedge-tailed Shearwater 
Juan Fernandez Petrel 
Mottled Petrel 
Black-winged Petrel 
Red-tailed Tropicbird 
Golden Plover 
Sooty Tern 
Shearwater-Petrel (unidentified) 
Tern (unidentified) 
Shorebirds (unidentified 
Birds (unidentified) 
Total 
No. Birds _ Birds/Night 
3 
0.50 
1 
0.17 
6 
1.00 
i 
0.17 
3 
0.50 
3 
0.50 
5 
0.83 
20 
3.33 
66 
11.00 
2 
0.33 
1 
0.17 
21 _ 
3.50 
133 
22.17 
TABLE VII 
HOURLY NOCTURNAL FLUCTUATION IN BIRD NUMBERS 
Date Hours after sunset 
1 2 3 4 5 
11 
09-10 62 o 
10-11 0 0 
11-12 1 0 
12-13 0 1 
13- 14 2 1 
14- 15 0 1 
Total o5 3 
0 
0 
1 
5 
o 
1 
9 
0 6, 9 5 
llll 
3 2 11 
2 10 1 
0 0 0 0 
1-10 0 
7 ii li 8 
2 
0 
1 
1 
1 
0 
5 
3 
0 
1 
1 
0 
0 
5 
5 
H O OJ O H O 
