The black-fronted tern, or tarapirohe, breed only on the braided riverbeds of the eastern and southern South Island, from Marlborough to Southland. They forage on or near braided channels of inland rivers and streams, often at high altitudes, and on nearby farmland, either under pasture or cultivation. They are less often seen over scrub and tussock.
After breeding, birds disperse to coastal areas, roosting in sheltered harbours, estuaries and lagoons, such as the Limestone Coast, gathering in flocks of up to 300 birds. They forage mostly offshore but also on near-coastal farmland.
Sadly, they are nationally endangered due to predation and habitat loss, with a population estimated at between 5000-10000.
Source: https://www.nzbirdsonline.org.nz/species/black-fronted-tern