sentences:  They may re-use burrows of wedge-tailed shearwaters ("Ardenna pacifica") or white-faced storm petrels ("Pelagodroma marina").Regardless of location, nests are well-hidden and hard to access; the depth of the nest has been measured as in crevices, approximately under ledges, and for reused seabird burrows.Rock parrots can nest in considerable numbers at some locations, with nests metres apart.