Tarsiger cyanurus
Silhouette: Martin Bulla, based on François Desbordes' illustration · PhyloPic
In 3 days ~10% in a week ~30%
The red-flanked bluetail (Tarsiger cyanurus), also known as the orange-flanked bush-robin, is a small passerine bird in the Old World flycatcher family. It breeds in mixed coniferous forests in northern Asia, parts of central Asia, and northeastern Europe. It is migratory, wintering mainly in southeast Asia, in the Indian subcontinent, the Himalayas, Taiwan, and northern Indochina.
The red-flanked bluetail was formally described in 1773 as Motacilla cyanurus by the German naturalist Peter Simon Pallas based on specimens seen near the Yenisei river in Russia. The specific epithet combines the Ancient Greek κυανος/kuanos meaning "dark-blue" with -ουρος/-ouros meaning "-tailed". The red-flanked bluetail is now placed in the genus Tarsiger that was introduced in 1845 by the English naturalist Brian Houghton Hodgson. The genus name is from Ancient Greek tarsos, "flat of the foot" and Latin gerere, "to carry".
The red-flanked bluetail belongs to a group of insectivorous birds known as chats, that were formerly thought to be thrushes. Genetic analysis showed that they were in fact a type of Old World flycatcher, with the resemblance to thrushes being the result of convergent... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Nikko National Park | 🇯🇵 Japan | |
| 2 | Cuc Phuong National Park | 🇻🇳 Vietnam | |
| 3 | Taroko National Park | 🇹🇼 Taiwan | |
| 4 | Doi Inthanon National Park | 🇹🇭 Thailand |
Rare
Under 5% of wildlife watchers report a Red-flanked Bluetail sighting in Taroko National Park on a given day, based on 61 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 89th most-seen of the 147 birds we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
December
In that month about 20% of wildlife watchers report a Red-flanked Bluetail in Taroko National Park on a given day, against under 5% in March to November, the lowest months.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Red-flanked Bluetail sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
3rd of 4
Of the 4 parks where we can rate Red-flanked Bluetail sightings, Taroko National Park ranks 3rd at under 5%. The best odds are in Nikko National Park (Japan, about 10%) and Cuc Phuong National Park (Vietnam, about 10%).
GBIF citizen-science records
It is estimated from how often the Red-flanked Bluetail is recorded against all the birds logged in Taroko National Park (61 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.
