North Island Brown Kiwi
The most common kiwi species, with eggs among the largest relative to body size.
The North Island brown kiwi (Apteryx mantelli) is a nocturnal flightless bird and species of kiwi that is widespread in the northern two-thirds of the North Island of New Zealand and, with about 35,000 remaining, it is the most common kiwi species. The eggs laid by the North Island brown kiwi are among the largest eggs relative to its body size.
Quick Facts
- Scientific name
- Apteryx mantelli
- Conservation status
- Vulnerable (IUCN Red List)
- Diet type
- Omnivore (Invertebrates, fruit, seeds)
- Primary habitat
- Native forests and scrubland of the North Island
- Unique trait
- Nostrils located at the tip of the beak
Lore & Background
The North Island brown kiwi was first described as Apteryx australis by Abraham Dee Bartlett in 1813 based on a specimen from Dusky Sound, South Island. It is a monotypic species. Through genetic testing in 1994, the tokoeka was separated into its own species, and later in 2003, the rowi was also determined to be a separate species, leading to the official binomial name Apteryx mantelli for the North Island brown kiwi. In 2004 an injured bird with streaked white around the head was found, likely due to a rarely seen genetic variation described as a partial albino.
Reader's Guide
The North Island brown kiwi is a large brown kiwi with spiky, streaked feathers. It displays size-based sexual dimorphism: males weigh 1.44–3.06 kg and females weigh 2.06–3.85 kg. The long bill measures 13–20.5 cm. It is nocturnal and flightless. Its diet primarily consists of invertebrates (85–95%) and plant material. It forages by tapping and probing the ground, using remote touch and smell. It is monogamous, with the female laying up to 5 eggs per clutch (average 2) and up to 7 eggs per season. The male solely incubates the eggs. Eggs are 12.5 cm × 7.8 cm and weigh 430 g. The genome was sequenced in 2015.
Did You Know?
- The North Island brown kiwi has the smallest visual field reported of any bird species that rely on non-visual cues for foraging.
- The bill-tip sensory organ contains mechanoreceptors sensitive to vibrations and pressure gradients of underground prey.
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