Horornis diphone
Silhouette: Sheatherius · PhyloPic
In 3 days <5% in a week ~10%
The Japanese bush warbler (Horornis diphone), known in Japanese as uguisu (鶯), is an Asian passerine bird more often heard than seen. Its distinctive breeding song can be heard throughout much of Japan from the start of spring.
The Japanese bush warbler is olive brown above and tending toward dusky colors below. It has pale eyebrows. It has a beak that curves up making it look like it is smiling. The bird is typically 15.5 centimetres (6.1 in) in length.
The Japanese bush warbler is a common year-round resident throughout Japan (except Hokkaidō) and the northern Philippines. In summer the Japanese bush warbler can also be found in Hokkaidō, Manchuria, Korea, and central China. In winter, the bush-warbler can also be found in southern China and Taiwan.
It was introduced to Oahu between 1929 and 1941 and has since spread throughout the main Hawaiian Islands. In summer, it ranges from low hills to high mountains, preferring bamboo thickets and black pine trees. In winter it seeks cover at lower elevations.
The propensity of the Japanese bush warbler to sing has led to the birds being kept as cage birds. Robert... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Nikko National Park | 🇯🇵 Japan | |
| 2 | Taroko National Park | 🇹🇼 Taiwan |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Ueno Zoo | 🇯🇵 Japan | |
| 2 | Inokashira Park Zoo | 🇯🇵 Japan |
Rare
Under 5% of wildlife watchers report a Japanese Bush Warbler sighting in Taroko National Park on a given day, based on 17 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 118th most-seen of the 147 birds we can rate there. Over three days the chance rises to under 5%, and over a week to about 10%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Japanese Bush Warbler in Taroko National Park on a given day, so our monthly data shows no clear season.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Japanese Bush Warbler sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
2nd of 2
Of the 2 parks where we can rate Japanese Bush Warbler sightings, Taroko National Park ranks 2nd at under 5%. The best odds are in Nikko National Park (Japan, about 70%).
Same genus: Horornis
The closest relatives of the Japanese Bush Warbler that you can see in Taroko National Park (genus Horornis, Typical Bush Warblers) are Yellowish-bellied Bush-Warbler (about 30%) and Brownish-flanked Bush-Warbler (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Japanese Bush Warbler is recorded against all the birds logged in Taroko National Park (17 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.
