This paper reports on a program that tested suitability of wedge-tailed shear-waters (Puffinus pacificus ) to incubate eggs and rear chicks of Newell's shearwaters, (Puffinus puffinus newelli ) and evaluated the 'normality' of cross-fostered fledglings. The average growth rates of chicks are presented, and the chronology of breeding is compared with that of Kawuai's wild population of Newell's shearwaters.