Sylvia undata
Silhouette: Martin Bulla, based on John Cox's illustration · PhyloPic
In 3 days ~20% in a week ~30%
The Dartford warbler (Curruca undata) is a Sylviid warbler from the warmer parts of western Europe and northwestern Africa. It is a small warbler with a long thin tail and a thin pointed bill. The adult male has grey-brown upperparts and is dull reddish-brown below except for the centre of the belly which has a dirty white patch. It has light speckles on the throat and a red eye-ring. The sexes are similar but the adult female is usually less grey above and paler below.
Its breeding range lies west of a line from southern England to the heel of Italy (southern Apulia). The Dartford warbler is usually resident all year in its breeding range, but there is some limited migration. The Dartford warbler was first described in 1776 by the Welsh naturalist, Thomas Pennant. He introduced the English name and based his description on two specimens that had been obtained by the ornithologist John Latham from Bexley Heath, near Dartford in Kent. In 1783 Latham included the warbler in his A General Synopsis of Birds but did not coin the binomial name, Sylvia dartfordiensis, until the supplement to his work was published in 1787. However, in 1783, before the publication... Wikipedia →
Recording0:09
Italy · 2024
© Jessica Peruzzo · iNaturalist · CC BY-NC-ND 4.0
Recording0:06
France · 2025
© Sylvain G · iNaturalist · CC BY-NC 4.0
Recording0:11
Spain · 2022
euqirneto · iNaturalist · CC0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Monfragüe National Park | 🇪🇸 Spain | |
| 2 | Doñana National Park | 🇪🇸 Spain | |
| 3 | Sierra Nevada National Park | 🇪🇸 Spain | |
| 4 | Ordesa y Monte Perdido National Park | 🇪🇸 Spain | |
| 5 | Sierra de Guadarrama National Park | 🇪🇸 Spain | |
| 6 | Camargue | 🇫🇷 France | |
| 7 | Picos de Europa National Park | 🇪🇸 Spain | |
| 8 | Pyrénées National Park | 🇫🇷 France |
With luck
About 10% of wildlife watchers report a Dartford Warbler sighting in Sierra de Guadarrama National Park on a given day, based on 271 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 97th most-seen of the 202 birds we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
February–March, May–July and November–December
In those months about 10% of wildlife watchers report a Dartford Warbler in Sierra de Guadarrama National Park on a given day, against under 5% in January, April and August–October, the lowest months.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Dartford Warbler sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 8 parks where we can rate Dartford Warbler sightings, Sierra de Guadarrama National Park ranks 5th at about 10%, level with the leaders once rounded. The best odds are in Monfragüe National Park (Spain, about 10%), Doñana National Park (Spain, about 10%) and Sierra Nevada National Park (Spain, about 10%).
Same genus: Sylvia
The closest relatives of the Dartford Warbler that you can see in Sierra de Guadarrama National Park (genus Sylvia, Sylvia Warblers) are Blackcap (about 30%), Whitethroat (about 10%) and Orphean Warbler (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Dartford Warbler is recorded against all the birds logged in Sierra de Guadarrama National Park (271 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.
