5 
December 1964 - BCF cruise 
’ White-necked Petrel 
i 
The apparent increase in numbers of this race from four in Nove^ke; v~~ 
to 13 in December might "be the result of confusion with fairly white ~ 
• •* • 
necked Juan Fernandez Petrels, although It is not too likely. A slight 
concentration was noted in the southeastern comer of the area. 
» < •< 
Juan Fernanctez Petrel 
Numbers of this race dropped 48°/o from 297 in November to 156 
in December. Presumably numbers will decrease still further next month 
as the birds r breeding season approaches, toie southeastern corner of 
1 
the area had clearly the highest density of these birds. Three were 
seen within 5 miles of Oahu. 
1 
Leach 1 s Petrel 
This species decreased 45°/o from 96 in November to 53 i n December • 
Concentrations were seen in the northeast corner and in the soutnem 
end of the area. This species- will probably maintain similar numbers 
in the area throughout the winter. The increased numbers experienced 
in the fall and spring reflect migration peaks, while the lower winter * 
plateau represents a wintering population in all likelihood. ^ 
Fork-tailed Petrel 
** • 
\ 
One bird doubtless of this species was observed on 7 December. This 
species may be of regular occurrence in the area in winter but due to 
J 
the extreme difficulty in clear observation of this species few ill ever 
be recorded. 
