26 Oct. It may have a tendency to stay around the building island same as if they were haring [illegible] successfully. This is only an idea since there is no way of proving that roosting birds are next failures. They are so gumpy that as soon as an approach is made, all are up in the air in wild confusion. I have not ever been able to sample the bigoon roosting birds for band recotries. Averaging plot samples [illegible] incidentally, were hoped to get maximum efficiency in counting on a bird at night. Hence, if for some reason, one becomes confused in counting, it was simply a matter of starting over again since the boundaries were stable. Plot: by averaging adults counted in plots, an average plot contains 177 adults. By figuring 2 adults per chick or kitten [illegible], the average plot has 23.5 adults. This latter figure is more logical and will be used in the final estimation. In two plots which had fewer than adults per egg or chick, another reason may be that some parents would be out to near feeding or catching food for the chicks, & in fact it is not [illegible] unlikely that both parents & every chick or egg would be on the island every night. 27 Oct. An estimated 1000 Sooties roosting on the dry-slightly moist mud flats along WNN mile of bayon.