THE BLACK NODDYANOUS TENUIROSTRISON ASCENSION ISLAND PART 1. GENERAL BIOLOGY

SUMMARY Several colonies of Black Noddies Anous tenuirostris on Boatswain Bird Island, off Ascension, were studied for almost a year, including the whole of one breeding period and the start of another. Between the breeding periods the noddies roosted on their ledges in the breeding colonies, so observations could be made throughout the year. The single eggs were laid on small ledges, usually on steep cliffs; nest material was scarce, and some...