All 18 species of penguins are unable of flying and, in fact, are better suited to swimming and diving, which is what they do most of the time.
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Penguin :
Steamer ducks exist in four kinds, three of which are flightless, but it's best to stay away from the other two.
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Steamer duck :
Another bird native to New Zealand is the weka, which is also a skilled swimmer.
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Weka :
Ostriches, the largest living bird, can reach heights of 9 feet and weights of more than 300 pounds.
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Ostrich :
In New Zealand, there are five different species of kiwi, brown chicken-sized birds with hidden vestigial wings and delicate, hairlike feathers.
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Kiwi :
Another native of New Zealand is the kakapo, often called an "owl parrot." This nocturnal parrot looks like an owl, stands like a penguin, and walks like a duck.
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Kakapo :
This medium-sized bird from New Zealand is a skilled hide-and-seek player. It has vibrant blue and green plumage and a red bill.
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Takahe :
The middle toes of each foot of the cassowary have a wicked dagger-like claw that may grow up to 4 inches long, and they have been known to kill people