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Sedge warbler migration Acrocephalus schoenobaenus
ⶠFollow the sedge warbler across the big globe
Press ⶠto play the year. Line: a simplified typical route, joining the main cluster of GBIF records in each month (adjusted for observer effort).
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| Scientific name | Acrocephalus schoenobaenus |
|---|---|
| Wingspan | 19 cm |
| IUCN status | Least concern |
| Records mapped | 897,397 (GBIF) |
| GPS / geolocator tracks | none with an open licence yet |
Facts from Wikidata Q27236 (CC0).
When does the sedge warbler arrive in the UK?
A summer visitor in the records: sightings jump in mid April and fall away after late August.
Bars: this speciesâ share of all UK bird records in GBIF (CC0/CC BY), by month, scaled to the peak month. Based on 134,708 UK records. Weekly counts from the GBIF occurrence search API (country=GB). Dates are read from records, not from a survey, so treat them as a guide.
When do they arrive in and leave the UK? â
Migration in the data
897,397 GBIF records (CC0 and CC BY 4.0 licences only) are mapped here, in 1.41° grid cells, month by month.
In Europe and Africa, the centre of the records (adjusted for observer effort) is furthest north in June (about 56°N) and furthest south in January (about 4°S).
More than half of the effort-adjusted signal there is south of the Equator in: January, December.
Month by month: centre of records in Europe and Africa
| Month | Centre (latitude) | South of the Equator |
|---|---|---|
| January | 4°S | 56% |
| February | 10°N | 31% |
| March | 21°N | 23% |
| April | 40°N | 6% |
| May | 49°N | 2% |
| June | 56°N | 1% |
| July | 55°N | 1% |
| August | 52°N | 0% |
| September | 47°N | 2% |
| October | 34°N | 7% |
| November | 11°N | 32% |
| December | 1°S | 51% |
Tracked birds
No openly licensed (CC0 / CC BY) tracking data package for this species was found in the Movebank Data Repository yet, so only records are shown.
About the sedge warbler
The sedge warbler is an Old World warbler in the genus Acrocephalus. It is a medium-sized warbler with a brown, streaked back and wings and a distinct pale supercilium. Sedge warblers are migratory, crossing the Sahara to get from their European and Asian breeding grounds to spend winter in Africa. The male's song is composed of random chattering phrases and can include mimicry of other species. âŠ
From the Wikipedia article âSedge warblerâ (revision 1315258838), CC BY-SA 4.0.
Sources
GBIF occurrence records, licence CC0 1.0 or CC BY 4.0 only, observations only (no specimens), filtered with: taxonKey=2493129&license=CC0_1_0&license=CC_BY_4_0&occurrenceStatus=PRESENT&hasGeospatialIssue=false&basisOfRecord=HUMAN_OBSERVATION&basisOfRecord=MACHINE_OBSERVATION&basisOfRecord=OBSERVATION. Monthly queries: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec. GBIF.org (23 October 2026) occurrence data accessed via the GBIF API; a GBIF download DOI is still to be added. Contributing datasets.