Exotic plants and animals are the most serious challenge to many of New Zealand's indigenous plant and animal species such as the moa birds that are now extinct.

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Exotic plants and animals can outcompete native species for resources and can also introduce new diseases or predators, causing harm to the indigenous species. The extinction of moa birds is believed to be partly due to the arrival of the Polynesians and the introduction of rats, which preyed on their eggs and chicks.

Exotic Plants and Animals Are the Most Serious Challenge to Many