ATF No. 6 DRAFT 5. Adults on Nests No. Percent Adults and Subadults Roosting No. Percent Banded 14 38 196 64 Banded on Baker Is. 15 41 12 4 Banded on Howland Is. 6 16 79 26 Banded on Enderbury Is. 2 5 15 5 Banded on Birnie Is. -- -- 2 Banded on Jarvis Is. -- -- 1 } 2 Banded on Phoenix Is. -- -- 2 } Total 37 306 If we examine the figures for nesting birds first we find that over 40 percent of the birds nesting now were present on Baker in July. This is not surprising since birds on eggs in July would have nestlings now. What is surprising is that only 8 of the 37 nesting birds had been banded prior to July 1964. Using data from Howland Island, 40 miles north, we find that less than 20 percent of nesting birds and more than 80 percent of birds in roosting clubs are unbanded. The nesting birds on Baker must have come from this floating population of roosting birds rather than from estab- lished nesting populations on other islands. The data on the roosting birds indicates that most of the birds on Baker previously roosted on Howland Island and a smaller number roosted on Enderbury. The very small number of birds coming from Birnie and Phoenix is hard to explain in view of their closeness to Enderbury and the large interchange between these three islands. Differences in population size