Pallas's Warbler

Phylloscopus proregulus

Introduction

Still a magical sight for anyone who finds one (they are commonest on the east coast in October/November), these tiny birds will have travelled more than 3,000 miles from breeding grounds in the Far East.

Key Stats

Status

Rare

Weight

6.5g

Seasonality

<1%

BTO Records

5.8k records

Population and distribution stats for:

No data

No current data

No current data

No data

No current data

450% expansion

Identification

Curated resources to aid in the identification of Pallas's Warbler

Songs and Calls

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Listen to example recordings of the main vocalisations of Pallas's Warbler, provided by xeno-canto contributors.

Call:

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.

IUCN Red List of Threatened Species (global)

Least Concern

Schedule 1 Licence required (to disturb)*

Birds Directive Annex 1

Listed on the Annexes of*

Bern(III), Bonn(II)

* 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*

Norfolk, 1896

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

Population Change

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Pallas's Warbler is a scarce migrant, seen predominantly in late autumn, mostly along the east coast; it is a species that is becoming more common and the occasional overwintering bird has led to individuals establishing territories in the breeding season before departing for more traditional breeding grounds [White & Kehoe 2024; Eaton & the Rare Breeding Birds Panel 2023a].

Distribution

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Pallas's Warblers are rare late-autumn visitors from Siberia. During 2007–11 they were recorded from 58 10-km squares in winter, with 52 of these involving sightings in November only. The bulk of the records were from the North Sea coast between Aberdeenshire and north Norfolk. In contrast, several of the records in English south-coast counties were made in midwinter.

Occupied 10-km squares in UK

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

No. occupied in winter

% occupied in winter

1.9%

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 Pallas's Warbler

Click the map to enlarge,
or view it on Bird Atlas Mapstore.

Breeding Distribution for Pallas's Warbler

Click the map to enlarge,
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.

Distribution Change

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Change in occupied 10-km squares in the UK

These figures come from Bird Atlas 2007-11 and indicate by how much occupied areas have expanded or contracted over recent decades.

% change in range in winter (1981–84 to 2007–11)

450 %

Bird Atlas distribution change maps show how bird distributions have changed through time. Coloured upward-pointing triangles show places apparently colonised over the period; grey downward-pointing triangles show places apparently vacated. Shading show places occupied.

Winter Distribution change for Pallas's Warbler

Click the map to enlarge,
or view it on Bird Atlas Mapstore.

Seasonality

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Pallas's Warbler is a scarce autumn passage migrant with most birds arriving in October and November; some birds have wintered and there are occasional spring records.

Weekly pattern of occurrence

The graph shows when the species is present in the UK, with taller bars indicating a higher likelihood of encountering the species in appropriate regions and habitats.

Phenology graph — Weekly occurrence patterns (shaded cells and reporting rates (vertical bars) based on BirdTrack data. Reporting rates give the likelihood of encountering the species each week.

Movement

Information about Pallas'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 Pallas's Warbler, including statistics on nesting, eggs and lifespan based on BTO ringing and nest recording data.

Productivity and Nesting

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Nesting timing

Typical (exceptional) number of broods

Source

Egg measurements

Typical length x width

14x11 mm

Mass (% shell)

0.9g (5%)

Source

Incubation

Incubation by

Fledging

Type of chick

Altricial, downy

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.

Biometrics

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Wing length and body weights are from live birds (source).

Wing length

Average ±1 std deviation; range and sample size in brackets.

Juvenile

51.2±2.4 mm

(47.5-55 mm, N=50)

Body weight

Average ±1 std deviation; range and sample size in brackets.

Juvenile

51.2±2.4 mm

(47.5-55 mm, N=50)

Ring Size

Classification, names and codes

Taxonomy, names and species codes for Pallas's Warbler

Classification and Codes

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Order: Passeriformes
Family: Phylloscopidae
Scientific name: Phylloscopus proregulus
Authority: Pallas, 1811

BTO 2-letter code: PA
BTO 5-letter code: PALWA
Euring code number: 12980

Alternate species names

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Catalan: mosquiter reietó
Czech: budnícek zlatohlavý
Danish: Fuglekongesanger
Dutch: Pallas' Boszanger
Estonian: kuld-lehelind
Finnish: hippiäisuunilintu
French: Pouillot de Pallas

German: Goldhähnchen-Laubsänger
Hungarian: királyfüzike
Icelandic: Kollsöngvari
Irish: Ceolaire Pallas
Italian: Luì di Pallas
Latvian: Sibirijas kaukitis
Lithuanian: nykštukine pecialinda
Norwegian: Fuglekongesanger

Polish: swistunka zlotawa
Portuguese: felosa-de-pallas
Slovak: kolibiarik králikovitý
Slovenian: kraljicica
Spanish: Mosquitero de Pallas
Swedish: kungsfågelsångare
Welsh: Telor Pallas

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.

BTO

Esmée Fairbairn Foundation

JNCC

RSPB

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Pallas&#039;s Warbler

Pallas's Warbler

Introduction

Key Stats

Identification

Songs and Calls

Call:

Status and Trends

Conservation Status

Population Size

Population Change

Distribution

Occupied 10-km squares in UK

Distribution Change

Change in occupied 10-km squares in the UK

Seasonality

Weekly pattern of occurrence

Movement

Britain & Ireland movement

Foreign locations of birds ringed or recovered in Britain & Ireland

European movements

Biology

Productivity and Nesting

Nesting timing

Egg measurements

Incubation

Fledging

Survival and Longevity

Biometrics

Wing length

Body weight

Ring Size

Classification, names and codes

Classification and Codes

Alternate species names

More Evidence

More evidence from Conservation Evidence.com

Partners

Search by common or scientific name

Pallas's Warbler