Alternatively (Austin 1996, Austin et al. 2004), it could be a monotypic subgenus (Ardenna sensu stricto), an Atlantic representative of the light-billed Hemipuffinus group (Pink-footed shearwater and Flesh-footed Shearwater).
They also found that the thrush is a regular predator of the eggs and small chicks of the Great Shearwater, being responsible for almost half of the egg losses by that species during the early incubation period in a colony on Inaccessible Island.
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