An eerie "oooow, oooow, oooow-eekkk"; a series of yelp-like sounds; given almost exclusively around the colony, though may be heard at sea close to breeding areas. Although petrels were generally silent at sea, Simons et al. (2006) summarized that individuals at chum slicks occasionally uttered single "waaahh" or "aaa-aw," when feeding (Wingate 1964, Imber 1985, Lee, pers. obs.). On one occasion in December Lee noted that a large number of petrels he saw at sea were vocal.