TABLE 1. Summary of Northern Grid observations, November 1966, 
^ ’ DIURNAL 
Date 
No.- Miles 
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 
Shearwater-Petrel 
14? 
0.60 
4 
30,000 
t 
90.2 
Storm Petrel 
10 
o.o8 
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 
4 
35,200 
100.0 % 
