3 
either species may occur as a single bird* However, the sightings of a single 
Slenderbill are quite scaree relative to the number of single Sooties identified. 
Large day to day variations in the number of Sooty/Slendertills occurred 
throughout the grid cruise. There was no east-west pattern of abundance, and 
the writer feels that when either species is abundant in one part of thf grid 
they may well be just as numerous over the rest of the area. In other words, 
it is postulated that both species pass through in ’’waves” which probably 
originate in areas other than the central facific. That no east-west pattern 
of abundance is found may be interpreted from data collected on this cruise. Almost 
all birds were travelling due south, yet there were days when large numbers 
were observed noirth or south of a preceding or following day when low numbers 
were seen. Thus it would seem logical to surmise that in November the flew is 
not continuous, but interrupted and in "waves”. 
X 
Generally the Sooties and Slenderbills were not observed feeding or loitering 
* 
in their southward movement. However, there were scarce observations of birds 
milling and feeding. This occurred most frequently on 22 November when three 
separate groups of Sooty and/or Slenderbills were observed apparently searching 
for food. One of these groups was with a mixed feeding flock with five other 
species of birds. 
Pale-footed Shearwater 
The peak of the migration of this species appears to have passed in October. 
It is interresting to note t!at this peak seems to have been reached durin c an 
apparent lull in the Sooty and Slenderbill migration, both of which the Pale- 
foot frequently associates with. 
Newell’s Shearwater 
A single bird was seen shortly after sunset on the 19th. 
Lark-rumped Petrel 
Two separate sightings of this Hawaiian Island breeder were recorded this 
month. Accumulated evidence would suggest ihat this is a regular "winter” visitor 
to the grid area. 
