Bonin Island Petrel (3 - see above) 
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Two were seen on December 9> 90 miles south of Laysan, and another 
was seen at sunset on the 11th about 240 miles east of Laysan. This 
species apparently does not range far from the breeding grounds during 
nesting, at least not to the south. 
Upon leaving Laysan near sunset on December 10, birds were flying 
in to the island from the west at the rate of 300 + per five minute period 
at 1750. This had decreased to 100-125 at 1800 and to 10 by 1815. This 
corresponds to the pattern observed on the island on previous visits. 
When within 200-500 yards, this race can easily be distinguished 
from the Black-winged Petrel. The head is very dark, especially on the 
sides; the entire back is darker gray; and the underwing border has a 
distinctive thickening near the tip as well as a heavy hash mark. 
Sooty Storm Petrel (4) 
Four were observed 60 miles south of Nihoa. In addition, two were 
seen within 10 miles of Laysan when departing December 10. 
♦ j .« 
Leach*s Storm Petrel (ll) 
Only 11 were seen most of them between Oahu and the grid in contrast 
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to 4l in November. This is probably due to difficulty of observation due 
to the rough seas and strong wind, rather than an actual decrease. This 
species would be most subject to this type of error. 
Kermadec Petrel (l) 
This species decreased from 8 last period to 1 this month, probably 
as a result of birds moving south for the breeding season. 
