TABLE' 4. Nocturnal abundance of 
species 
in the Northern 
Grid, 
November, 1966. 
Birds/ 
■< 
Species No. 
Birds 
Linear Mile 
No. Collected 
Black-winged Petrel 
i 
0.01 
unidentified small Pterodroma 
5 
o.o6 
unidentified large Pterodroma 
2 
0.02 
shearwater-petrel 
9 
0.11 
Leach’s Storm Petrel 
1 
0.01 
i 
Sooty Tern 
3 
0.04 
Miscellaneous 
4 
0.05 
TOTALS 
25 
0.51 
i 
TABLE 5* Flock composition by species in the Northern Grid, 
November 1966, 
* 
Soecies No. in Total Flocks % in Total Flocks 
Slender-billed Shearwater 28 23#0 % 
Sooty and/or Slender-billed Shearwater 31 25*4 % 
Juan Fernandez Petrels 20 16.4 % 
Black-winged Petrels 3^ 29.5 ^ 
white-rumped storm petrels including 7 5«7 
Leach*s Storm Petrel 
122 100.0 % 
\ 
* 
Total flocks s 7 f with average flock size of 17*4 # 
