and 40,000 nestlings were found distributed in eight large colonies. Most 
of the birds were in bunchgrass habitat, though large numbers were found 
in the morning-glory areas at the north end of the island. By September 
1964 only 4000 i mm atures remained on the island. About 3500 birds were 
circling the island in two groups in March 1965* A small group of about 
500 was circling a bunchgrass area at the northern end of the island. 
s 
The remairfder was forming over the interior of the southern end of the 
island, and sitting briefly during the day. The following July an estimated 
250,000 adults, 50,000 immatures, and 50/000 nestlings were found on the 
island. The colony was largely confined to bunchgrass habitat in the 
interior of the island, j 
Reproduct ion : Palmer found many small nestlings on Lisianski in late June 
1891 (Rothschild, 0 £. cit .). Wetmore (unpub. notes, 1923) found about 250 
pairs With eggs in May 1923* Large numbers were circling the island in 
March I96I, but no eggs were found (Woodside and Kramer, o£. cit .). 
The P0BSP has found adults forming over the island on each of its 
March visits. Most of the 50,000 nestlings found in July 1965 were nearly 
fledged. An equal number of immatures were found. A few pairs were still 
incubating eggs. In August 1964 the 40,000 nestlings ranged from one third 
grown to nearly fledged. Some immatures were present. There; seemed to be 
an adult with each nestling or immature at night. A complete albino and a 
.. ... ' ( ■ > 
partial albino nestling was observed. By September 1964 only 4000 immatures 
remained in the colony. - \ 
On Kure Atoll, 300 miles to the northwest, egg-laying occurs primarily 
in May, and hatching in June. Adults leave the atoll before the immatures, 
/ 
and most of the latter are gone by mid-September. The P0BSP has observed 
too much variation^in the cycles of individual breeding colonies of this 
