Phylloscopus calciatilis
Silhouette: Jiekun He · PhyloPic
In 3 days ~50% in a week ~80%
The limestone leaf warbler (Phylloscopus calciatilis) is a species of warbler in the family Phylloscopidae. When this species was first seen, beginning in 1994, it was mistaken for the similar sulphur-breasted warbler. It is smaller than the sulphur-breasted warbler, and has more rounded wings. The plumage is almost identical, with comparisons showing only a slightly colder yellow below and a greyer tinge above. Although smaller, the bill is proportionally larger than that of the sulphur-breasted warbler. Accurate measurements are not available; the holotype has a wing length of 5.2 cm (2.0 in); the paratype a tail length of 3.7 cm (1.5 in) and a bill length of 1.39 cm (0.55 in). The species is known to occur in northern Vietnam and Laos, and potentially also occurs in southern China as well. The species name, calciatilis, means "dwelling on limestone", which along with its common name is a reference to its natural habitat, which is broadleaved evergreen and semi-evergreen forest growing around limestone karst mountains. The bare-faced bulbul, described in 2009, was found in the karst of the same region.
The limestone leaf warbler (Phylloscopus calciatilis) is smaller... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cuc Phuong National Park | 🇻🇳 Vietnam |
More parks will be added in future updates.
Possible
About 20% of wildlife watchers report a Limestone Leaf-Warbler sighting in Cuc Phuong National Park on a given day, based on 71 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 37th most-seen of the 159 birds we can rate there. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
February
In that month about 40% of wildlife watchers report a Limestone Leaf-Warbler in Cuc Phuong National Park on a given day, against about 10% in April–May and August–October, the lowest months. That is one of Cuc Phuong National Park's driest months, with about 50 mm of rain against 390 mm in August. July has too few records to rate.
Between 3 and 6 am
Across all the parks we cover, that three-hour window holds the most Limestone Leaf-Warbler sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is most active around dawn and dusk.
Only Cuc Phuong National Park, in our data
Cuc Phuong National Park is the only park on Wallace's Line with enough records to rate Limestone Leaf-Warbler sightings: about 20% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Limestone Leaf-Warbler is recorded against all the birds logged in Cuc Phuong National Park (71 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.
