Which of the following is a unique bird species native to New Zealand?

The kiwi is a unique and iconic bird species native to New Zealand, recognized for its distinctive appearance and behaviors. This flightless bird is emblematic of New Zealand's wildlife, featuring a long beak, a round body, and a lack of wings. Kiwis are nocturnal and primarily ground-dwelling, relying on their keen sense of smell to forage for insects and worms in the forest floor. They hold significant cultural importance in New Zealand, often symbolizing the nation and its natural heritage.

In contrast, the puffin and macaw are not native to New Zealand; puffins are typically found in the Northern Hemisphere and are associated with colder coastal regions, while macaws are native to Central and South America. The emperor penguin, although native to the Southern Hemisphere, is primarily found in Antarctica, not New Zealand. Thus, the kiwi stands out as the only bird in the listed options that is uniquely native to New Zealand, representing a vital aspect of its biodiversity.