RS Brown 1968 20 Oct. Bulwer's Petrel McKean Island Bulwer's Egg measurements. 41.3 x 28.6 42.6 x 30.0 39.4 x 28.9 39.0 x 29.7 39.2 x 30.0 39.8 x 28.6 44.3 x 31.0 37.4 x 29.1 Summary Banded 33 birds and recovered 3-6 of them recollected this banded 35 banded individuals. Of these 6 there were known pairs + probably, a few more pairs at least banded unknowns. The pairs were: 1103-07080-81 one quarter 2x 54-56 712-57260-61 obs 1103-07079 62-63 712-57277 71-72 79-80 At least 10 nests were found with fresh to slight mistributed eggs and one with a small brown spring. Or other egg which hatched during the stay, making at least two with chicks upon departure. Five of six known pairs were calling from empty nest cavities and pre- tically all single banded birds were dug from empty nest cavities in rocks. Practically 100 % of all birds were first detected by hearing them call from the nest cavity, no matter what the contacts. RS Brown 1968 Bulwer's Petrel McKean Island Summary Thus during October in combination they recollected a peak in nest finding and egg laying. A few birds, probably in the order of 4 % had already laid 1 before and after (this concerns only those birds banded). If one considers all the birds, they act which were not banded this figure probably reduces to below 5 % having already laid before rec. better. (All along the major rock concen- trations along the main W side of NW, Bulwer's were in ample abundance. In the most part, positive detection could not be made due to the screaming bats, hawks - blue grey gulls etc. Much of the well to north hills area - lower first 25 birds heard from vague areas in these areas were actually ringed out. In the still standing walls, most birds could not be dug out without breaking down the entire wall. A few times I attempted to make some sort of density figures on the birds, but this was almost impossible. It was just as common for 3 or 4 birds to be heard calling from a few square feet in many areas of walls or tumbled down rock caves. A very conservative estimate I the island population would be 1000 birds - probably many more. At the end of October I estimated 5 % were dead (swell to include brown chicks); 36 % were on eggs and 67 % were either settled or inspecting nest sites.