This series includes 88 small notebooks (MSS. 15037/88-101) containing lengthy, detailed records of observations by African natives of individual nests. The notes are in Kiswahili but many of the volumes also contain Moreau's own notes, his summaries of the natives' observations or his calculations based on their data. This data enabled Moreau 'to show for the first time that the rate at which the individual nestling receives food tends to decrease with the number of birds in the brood' (autobiography, Ibis, 112, p.554).