Only 1 family, 1 genus, 3 species. Distributed in New Zealand. "Several dimensions" is translated from its English name "kiwis". Body shape like a chicken, female big male small. The body length is 48 ~ 84 cm, and the weight 1.25 ~ 4.00 kg. Feathers are hairy and shaped like hair; The peak of the mouth is slender and slightly bent downward, and the nostrils are close to the mouth end, so the sense of smell is sensitive; Wings degenerate and cannot fly; Short and strong legs, good at walking; A foot has four toes, three in front and 1 behind. Most of the back feathers are dark brown, and the belly feathers are shallow with dark brown stripes; No tail feathers.

The brown kiwi is the national bird of New Zealand. It is 55 ~ 80 cm long and weighs 3.5 kg. It is distributed in South Island, North Island and Stewart Island of New Zealand (3 subspecies respectively) and is also the rarest species.

The youngest, Apteryx owenii, is 35cm long and weighs 1.2kg. There is one subspecies in South Island and North Island of New Zealand.

Apteryx haastii with several dimensions is only distributed in the South Island of New Zealand. Eggs are huge, second only to ostrich eggs, and weigh 1/4, which is the highest among all birds. Stay up late during the day and go out at night.