Chlidonias albostriatus
Silhouette: Andy Wilson · PhyloPic
In 3 days ~20% in a week ~30%
The black-fronted tern (Chlidonias albostriatus), sea martin, ploughboy, or tarapiroe (Māori), is a medium-small tern endemic to New Zealand. Black-fronted terns can be found in coastal habitats from the southern tip of the North Island to the eastern South Island as well as Stewart Island. Their breeding range is restricted to the South Island, where they will form breeding colonies on braided river islands.
The species is globally and nationally endangered, due to its small and declining national population. Black-fronted terns are vulnerable to a range of threats, including predation by introduced mammals, habitat loss (land use changes and weed encroachment), resource abstraction (gravel and water), human disturbance, and climate change.
German naturalist Johann Reinhold Forster described the black-fronted tern from a specimen collected at Queen Charlotte Sound, Marlborough in 1832, giving it the binomial name Sterna antarctica, which had already been used for the Antarctic tern by French naturalist René Lesson the previous year.
The first valid description of the species was by George Robert Gray in 1845, when it was described as Hydrochelidon albostriata. Its specific... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Aoraki Mount Cook National Park | 🇳🇿 New Zealand | |
| 2 | Fiordland National Park | 🇳🇿 New Zealand | |
| 3 | Arthur's Pass National Park | 🇳🇿 New Zealand | |
| 4 | Rakiura National Park | 🇳🇿 New Zealand | |
| 5 | Abel Tasman National Park | 🇳🇿 New Zealand |
With luck
About 10% of wildlife watchers report a Black-fronted Tern sighting in Rakiura National Park on a given day, based on 88 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 48th most-seen of the 80 birds we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
March
In that month about 20% of wildlife watchers report a Black-fronted Tern in Rakiura National Park on a given day, against under 5% in July, September–October and December, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Black-fronted Tern sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
4th of 5
Of the 5 parks where we can rate Black-fronted Tern sightings, Rakiura National Park ranks 4th at about 10%. The best odds are in Aoraki Mount Cook National Park (New Zealand, about 60%), Fiordland National Park (New Zealand, about 30%) and Arthur's Pass National Park (New Zealand, about 20%).
Same family: Laridae
The closest relatives of the Black-fronted Tern that you can see in Rakiura National Park (family Laridae, Gulls, Terns, and Skimmers) are Silver Gull (about 80%), Dominican Gull (about 70%) and White-fronted Tern (about 60%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Black-fronted Tern is recorded against all the birds logged in Rakiura National Park (88 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
