The plumage is dark grey-black overall, with a pale area (smaller than that of the South Island robin) on the belly and breast, and pale streaking on the upperparts. They are sexually dimorphic, with males having darker plumage than the females and being slightly larger.[4]
Their natural habitat is mostly native forest, particularly Podocarpus and southern beech (Nothofagaceae) forests, from sea level up to the tree-line.
Behaviour
Feeding
The North Island robin, like the South Island robin, is a terrestrial feeder foraging on or near the ground (unlike the related and more arboreal tomtit). Prey items are located by perch-hunting, where an individual waits at an elevated perch until prey is spotted, or by active searching; prey is taken from the leaf-litter, low vegetation (branches and foliage), and tree trunks. Numerous invertebrate prey are taken, including cicadas, earthworms, wētā, snails, and spiders. Fruit is also taken.[5] North Island robins cache food supplies for later when prey is plentiful, although males cache more food than females do.[11] Both sexes will steal food from their mate's cache, and are less likely to cache food, if their mate is present.
^"Toutouwai". Department of Conservation (New Zealand). Retrieved 30 June 2022.
^Miller, Hilary C. & Lambert, David M. (2006): A molecular phylogeny of New Zealand's Petroica (Aves: Petroicidae) species based on mitochondrial DNA sequences. Molecular Phylogenetics and Evolution40(3): 844–855.
^Armstrong, D (2001) "Sexing North Island robins (Petroica australis longipes) from morphometrics and plumage" Notornis48: 76–80
^ abHiggins, P.J. & J.M. Peter (eds) 2003. Handbook of Australian, New Zealand and Antarctic Birds. Volume 6: Pardalotes to Shrike-thrushes. Oxford University Press, Melbourne. ISBN0-19-553762-9