How to identify the North Island Brown Kiwi

To correctly identify the North Island Brown Kiwi (Apteryx mantelli), check each of these features. Birds can be tricky: habit, habitat, and call often confirm a sighting that a single photo cannot.

Size at a glance

Length

35-45 cm

Wingspan

Vestigial wings, not measurable as a functional wingspan (approx. 5 cm long)

Weight

Males: 1.4-2.8 kg; Females: 2.1-3.9 kg

Physical features to check

1. 1

   Plumage

   Overall feather coloration and pattern.

   The plumage is shaggy, coarse, and hair-like, typically mottled brown or reddish-brown with streaking of lighter buff or grey. This cryptic coloration provides excellent camouflage in the forest undergrowth. The feathers lack barbules, giving them a fur-like texture.

2. 2

   Beak shape

   Shape and color of the bill: a key field mark.

   Long, slender, slightly downcurved bill, typically pale ivory to brownish-pink. Unique among birds, the nostrils are located at the very tip of the bill, which is highly sensitive and used for foraging.

3. 3

   Eye color

   Iris color and any distinctive eye markings.

   Small, dark brown eyes, adapted for nocturnal vision but with limited acuity.

4. 4

   Leg color

   Leg and foot color.

   Strong, stout legs and feet, typically pale grey to brownish-pink. Four-toed feet with sharp claws.

5. 5

   Distinguishing features

   Standout features that separate this species.

   Flightless, nocturnal, long sensitive bill with nostrils at the tip, shaggy hair-like plumage, strong legs, absence of a tail, and vestigial wings.

6. 6

   Juvenile appearance

   How young birds differ from adults.

   Juveniles resemble smaller versions of adults, with similar plumage and bill characteristics. They grow rapidly.

7. 7

   Seasonal changes

   Plumage variation between breeding and non-breeding seasons.

   No significant seasonal changes in plumage. Their appearance remains consistent year-round.

8. 8

   Sexual dimorphism

   How males and females differ.

   Females are generally larger and heavier than males, and their bills are typically longer. Otherwise, plumage coloration is similar.

Key field marks

• Size and Shape. Look for a medium-sized, plump, pear-shaped bird with strong legs, no visible tail, and a hunched posture. It moves with a distinctive waddle.
• Plumage. Observe the shaggy, hair-like, mottled brown or reddish-brown feathers. This texture is unique among birds.
• Bill. The most distinctive feature is the very long, slender, pale bill with nostrils at the tip. This is used for probing and is unlike any other bird in New Zealand.
• Behavior. Nocturnal activity is a key indicator. Listen for its characteristic calls at night. If seen, it will be foraging by probing the ground with its bill.
• Habitat. Found exclusively in dense native forests and scrubland of the North Island.

Explore the North Island Brown Kiwi