Western Bonelli's Warbler

Phylloscopus bonelli

Introduction

Recently separated as a species from the eastern form, this is a rare visitor to Britain & Ireland from upland woodlands in southern Europe.

Records tend to come from the autumn period, which is unusual for a migrant species breeding at the western end of the Mediterranean.

Bonelli's Warbler was the first bird for which DNA data contributed to a split into two species.

Key Stats

Status

Very rare

Weight

Seasonality

BTO Records

948 records

Population and distribution stats for:

No data

No current data

% expansion

No data

No current data

No current data

Status and Trends

Population size, trends and patterns of distribution based on BTO and partnership surveys and atlasses with data collected by BTO volunteers.

Conservation Status

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This species can be found on the following statutory and conservation listings and schedules.

Species of European Conservation Concern

Least Concern

IUCN Red List of Threatened Species (global)

Least Concern

Schedule 1 Licence required (to disturb)*

Birds Directive Annex 1

* A guide only. Check details with the original legislation, especially those marked with an asterisk. See About Birdfacts for more information.

Population Size

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BOU Category

Source

First Record*

Skokholm, 1948

* First documented occurrence. Most species undoubtedly occurred before this. See About Birdfacts for more information.

Population Change

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Population trends of this scarce species are not routinely monitored.

Distribution

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This species is a rare vagrant and was recorded during Bird Atlas 2007–11 as shown on the map.

Occupied 10-km squares in UK

These figures come from Bird Atlas 2007 and indicate how widespread a species is.

No. occupied in breeding season

% occupied in breeding season

0.03%

No. occupied in winter

% occupied in winter

0.03%

Bird Atlas distribution maps show where bird species breed or winter in Britain and Ireland. For breeding maps, larger dots indicate higher certainty the species bred in that area.

Winter Distribution for Western Bonelli's Warbler

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or view it on Bird Atlas Mapstore.

Breeding Distribution for Western Bonelli's Warbler

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or view it on Bird Atlas Mapstore.

To view and download up-to-date distribution information aggregated from across BTO and partnership surveys and schemes, see our data holdings on the NBN Atlas.

European Distribution Map

European Breeding Bird Atlas 2

Distribution Change

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This vagrant is too rarely reported to map distribution change.

Seasonality

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This species has been too rarely reported to BirdTrack during 2011–22 to properly assess seasonality.

Movement

Information about Western Bonelli's Warbler movements and migration based on online bird portals (e.g. BirdTrack), Ringing schemes and tracking studies.

Britain & Ireland movement

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View a summary of recoveries in the Online Ringing Report

Foreign locations of birds ringed or recovered in Britain & Ireland

Dots show the foreign destinations of birds ringed in Britain & Ireland, and the origins of birds ringed overseas that were subsequently recaptured, resighted or found dead in Britain & Ireland. Dot colours indicate the time of year that the species was present at the location.

Winter (Nov-Feb)
Spring (Mar-Apr)
Summer (May-Jul)
Autumn (Aug-Oct)

Foreign locations of birds ringed or recovered in Britain & Ireland

European movements

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EuroBirdPortal uses birdwatcher's records, such as those logged in BirdTrack to map the flows of birds as they arrive and depart Europe. See maps for this species here.

Biology

Lifecycle and body size information for Western Bonelli's Warbler, including statistics on nesting, eggs and lifespan based on BTO ringing and nest recording data.

Survival and Longevity

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Survival is shown as the proportion of birds surviving from one year to the next and is derived from bird ringing data. It can also be used to estimate how long birds typically live.

View number ringed each year in the Online Ringing Report.

Classification, names and codes

Taxonomy, names and species codes for Western Bonelli's Warbler

Classification and Codes

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Order: Passeriformes
Family: Phylloscopidae
Scientific name: Phylloscopus bonelli
Authority: Vieillot, 1819

BTO 2-letter code: IW
BTO 5-letter code: BONWA
Euring code number: 13071

Alternate species names

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Catalan: mosquiter pàl·lid
Czech: budnícek západní
Danish: Bjergløvsanger
Dutch: Bergfluiter
Estonian: lääne-lehelind
Finnish: vuoriuunilintu
French: Pouillot de Bonelli

German: Berglaubsänger
Hungarian: Bonelli-füzike
Icelandic: Limsöngvari
Irish: Ceolaire Bonelli
Italian: Luì bianco
Latvian: Bonelli kaukitis
Lithuanian: šviesiapilve pecialinda
Norwegian: Eikesanger

Polish: swistunka górska
Portuguese: felosa-de-papo-branco
Slovak: kolibiarik horský
Slovenian: hribska listnica
Spanish: Mosquitero papialbo
Swedish: bergsångare
Welsh: Telor Bonelli y Gorllewin

More Evidence

More evidence from Conservation Evidence.com

Partners

Birdfacts is based on data collected by volunteers participating in surveys that are organised and funded by BTO, RSPB, Esmée Fairbairn Foundation, JNCC and other partners.