The tomtit (Petroica macrocephala) is a small passerine bird in the family Petroicidae, the Australian robins. It is endemic to the islands of New Zealand, ranging across the main islands as well as several of the outlying islands. It has several other English names as well. There are several sub-species showing considerable variation in plumage and size. The species is not threatened and has adapted to the changes made to New Zealand's biodiversity.