Table h* Summary of Nocturnal Observations in the Northern Grid 
November, 1966 
y 
Date 
Shearwater-Petrel 
Terns 
Others 
17-18 
11 
3 
1 
18-19 
8 
' 1 
1 
19-20 
3 
1 
3 
20-21 
18 * 
1 
3 
21-22 
11 ' _ 
2 
10 
22-23 
W 
1 
2 
-M- 16 seen before darkness 
# h seen after darkness 
