Almost half of the twenty-two species face some level of threat. Six species are listed as Vulnerable by the IUCN, facing a high risk of extinction, dying out, while one is Critically Endangered, facing an extremely high risk of extinction, and another two are Endangered, facing a very high risk of extinction. One species is Near Threatened, at risk of becoming threatened. The main reasons for threat include habitat loss, overharvesting of eggs, and predation by introduced animals.
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