- 5 - 
Black-winged Petrel (21) 
Absent in the grid from January through May 1966, a considerable buildup in 
numbers of this species occurred in July when 87 were recorded. Reduced numbers 
during the present survey may indicate that the birds move leisurely through the 
grid to “wintering 11 areas farther north. Small numbers may also winter in the 
grid since they were present throughout last fall. 
Cook f s Petrel (5) 
This species was first recorded in the grid during April 1966 when 2 specimens 
were collected. None were recorded last month, but their presence might have gone 
unnoticed due to confusion with races of Pterodroma hypoleuca . 
Bulwers Petrel (2) 
Consistently recorded in low numbers except during March 1966 when large 
numbers of migrating birds moved through the grid. 
White-throated Storm Petrel ( 2 3 nocturnal) 
Recorded in very low numbers in September 1965, May and July 1966. If distribution 
over the past year has been normal, a few stragglers can be expected regularly 
throughout summer and early fall months. During this period Leach 1 s Storm Petrels 
are present in their lowest numbers. 
« 
Leach 1 s Storm Petrel (l) 
white-rumped storm petrels (27 + 7 nocturnal) 
A single Leach*s Storm Petrel was collected on 17 August* The bird was a 
subadult and is presumed to be representative of the small “summering 11 population 
in the grid which does not migrate north during the species prebreeding year (s)* 
Most of the 3U other unidentified white-rumped storm petrels were probably Leach's. 
A few individuals were tentatively identified to Wilson's Storm Petrel. 
