These social birds were fairly common forming the core of mixed species flocks on Ulva Island where predators have been eradicated. Their overall range is restricted to South and Stewart Islands. The NZ Checklist calls this bird the "Brown Creeper" inviting confusion with an unrelated North American bird. Formerly placed in the monotypic genus Finschia, the Pipipi is one of only three species in the new Mohouidae family, all confined to New Zealand. These birds were formerly included in other families but recent genetic work found they form a clade basal to a larger Corvid assemblage. All three are the only known hosts of the Long-tailed Cuckoo. Canon PowerShot SX50 HS.
References:
Aidala, Z., N. Chong, M.G. Anderson, L. Ortiz-]Catedral, I.G. Jamieson, J.V. Briskie, P. Cassey, B.J. Gill & M.E. Hauber. (2013). Phylogenetic relationships of the genus Mohoua, endemic hosts of New Zealand's obligate brood parasitic Long-tailed Cuckoo (Eudynamys taitensis).Journal of Ornithology, 154: 1127-1133.
Boles, W. (2017). New Zealand Brown Creeper (Mohoua novaeseelandiae). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from http://www.hbw.com/node/59382 on 30 January 2017).
McKinlay, B. 2013. Brown creeper. In Miskelly, C.M. (ed.) New Zealand Birds Online. www.nzbirdsonline.org.nz