The species is threatened by the potential introduction of mammalian predators to its breeding islands, especially rats (probably brown rat Rattus norvegicus) because it feeds at ground-level in exactly the habitat used by foraging rats5. Its present distribution is inversely related to the presence of such predators, whose impact may have increased with the historic destruction of its habitat2,4. Rats and probably feral cats have destroyed entire populations4. Grazing pressure and uncontrolled fires are also potential threats6.
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