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General Discussion 
The substantial increase in numbers of flocks between this month’s 
total ( 78 ) and the total for April 1964 ( 27 ) is somewhat balanced by 
the difference in mean flock size. (29 birds per flock this month and 
69 in April 196k ). 
Direct migrants accounted for 13-5 0/0 of the month’s total (4068), 
and wintering birds accounted for an additional 10 0 / 0 . The remainder 
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is accounted for by birds breeding in the Central Pacific (71.5 0 / 0 ) and 
by unidentified birds (5 0 / 0 ). The large buildup in numbers of direct 
migrants, predominantly Sooty Shearwaters^ of the first week of April 1964 
was felt to have come during the in-port period between the March and 
April cruises this year, so that direct migrants did not attain anything 
near the 49 0/0 level they did on the March 1964 cruise. March and April 
1965 *s total numbers compare quite favorably. 
Overall distribution of the predominant species (Sooty Tern, Wedgetailed 
Shearwater) varied slightly between this month and April 1964. Greater 
concentrations were found along the 154° W leg down to 10°N and relatively 
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fewer birds were seen around Oahu and in the southeastern corner, although 
these two areas were still fairly active. 
Of special interest was the sighting of two mixed flocks of Leach’s 
Petrels and Bulwer’s Petrels. New high totals were recorded for Leach’s 
Peurel (297) and for Pomarine Jaeger ( 60 ), the latter enjoying the most 
widespread distribution noted for the species as well. Blue-gray Noddies 
were sighted for the first time. Significant sightings included a possible 
New Zealand Shearwater, a possible Herald’s Petrel, a gull, two long-tailed 
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