IUCN threat status:

Vulnerable (VU)

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Biology

The kakerori is a highly inquisitive and very territorial bird (3). Most one and two year old birds tend to form flocks away from territories, although some join their parents and help them to defend their territory and raise further young (3). Adult pairs remain in their territories throughout the year. They breed from October to February, with most eggs being laid in October and early November (3). The bulky nests are typically built of moss in a forked tree branch overhanging a stream (3) (4). One to two eggs are laid per clutch, and if a nest fails, pairs are able to produce a second clutch (3). Although kakerori are diminutive birds, they defend their nests fiercely; if an introduced ship rat (Rattus rattus) threatens the nest, the adults will stay and fight to the death (4).

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Source: ARKive

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