The thrush is thought to have evolved from an ancestor in the genus Turdus from South America, and resembles an immature Austral Thrush, but its adaptations to life on a small island group, including an unusual brush-tipped tongue modified for extracting the contents of eggs, have been used as reasons to warrant its separation into the monotypic genus Nesocichla.
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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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The thrushes are also known to kill both White-bellied and White-faced Storm Petrels directly, probably by taking them from their burrows.
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