Bradypterus graueri
Silhouette: Sheatherius · PhyloPic
In 3 days ~20% in a week ~50%
Grauer's swamp warbler (Bradypterus graueri) is a species of Old World warbler in the family Locustellidae. It is native to the Albertine Rift montane forests. Its natural habitats are freshwater lakes and freshwater marshes. It is threatened by habitat loss.
Grauer's swamp warbler is endemic to the Albertine Rift and is found in montane papyrus swamps above 1900m. An investigation of the species population genetic structure revealed three clades across this region: clade 1, Virunga Volcanoes and Kigezi Highlands; clade 2, Rugege Highlands; and clade 3, Kahuzi-Biega Highlands (with clades 2 and 3 being sister groups). The divergence between these clades is thought to be a result of landscape dynamics and a historic period of aridity.
The name commemorates the German zoologist Rudolf Grauer who collected natural history specimens in the Belgian Congo. BirdLife Species Factsheet. Archived 2009-01-03 at the Wayback Machine Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bwindi Impenetrable National Park | 🇺🇬 Uganda | |
| 2 | Nyungwe National Park | 🇷🇼 Rwanda |
With luck
About 10% of wildlife watchers report a Grauer's Swamp-Warbler sighting in Bwindi Impenetrable National Park on a given day, based on 178 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 152nd most-seen of the 400 birds we can rate there. Over three days the chance rises to about 20%, and over a week to about 50%, if each day is a fresh chance.
May
In that month about 20% of wildlife watchers report a Grauer's Swamp-Warbler in Bwindi Impenetrable National Park on a given day, against under 5% in September–October and December, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Grauer's Swamp-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.
Yes
Of the 2 parks where we can rate Grauer's Swamp-Warbler sightings, Bwindi Impenetrable National Park has the highest daily chance: about 10%. Next come Nyungwe National Park (Rwanda, about 10%).
GBIF citizen-science records
It is estimated from how often the Grauer's Swamp-Warbler is recorded against all the birds logged in Bwindi Impenetrable National Park (178 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.
