TABLE 1, Summary of Northern Grid observations* November 1966*. 
DIURNAL 
Date 
No, Niles 
No,, Hours 
No, Birds 
No, Species 
12 November 
123 
11.8 
163 
6 
NOCTURNAL 
11-12 November 
81 
8.3 
25 
6 
GRAND TOTAL 
204 
20.1 
188 
7 
TABLE 2', Diurnal density of species groups in the Northern Grid* 
November 1966, 
Species Group 
No, Birds 
Birds/ 
Square Mile 
Estimated 
50,000 Sq 
Pop./ 
. Mi. 
% Total 
Birds 
V 
Shearwater-Petrel 
147 
0.60 
4 
30,000 
• 
90.2 
Storm Petrel 
10 
0.08 
4,000 
6.1 
Tropicbird 
1 
0.01 
500 
0.6 
Frigatebird 
4 
0.01 
500 
2.5 
Miscellaneous 
1 
0.004 
200 
0*6 
163 
0,66 
$ 
35,200 
100.0 % 
