Western Olivaceous Warbler

Iduna opaca

Introduction

Western Olivaceous Warbler is a very rare vagrant in ther UK, with the first record occuring in 2023. The species breeds mainly in north Africa and southern Iberia. It winters in sub-Saharan west Africa. Its status in the UK contrasts markedly with that of its eastern counterpart, the Eastern Olivaceous Wartbler, which has been recorded in the UK over 20 times.

Key Stats

Status

Very rare

Weight

10.5g

Seasonality

Population and distribution stats for:

No data

No current data

No current data

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.

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*

Shetland, 2023

* 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.

Movement

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

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.

The Eurasian-African Migration Atlas shows movements of individual birds ringed or recovered in Europe. See maps for this species here.

Biology

Lifecycle and body size information for Western Olivaceous 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.

Classification, names and codes

Taxonomy, names and species codes for Western Olivaceous Warbler

Classification and Codes

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Order: Passeriformes
Family: Phylloscopidae
Scientific name: Iduna opaca
Authority: Cabanis, 1851

BTO 5-letter code: WEOWA
Euring code number: 12552

Alternate species names

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Catalan: busqueta de Barbaria
Czech: sedmihlásek západní
Danish: Vestlig Bleg Gulbug
Dutch: Westelijke Vale Spotvogel
Finnish: iberiankultarinta
French: Hypolaïs obscure

German: Isabellspötter
Hungarian: spanyol geze
Icelandic: Hrímsöngvari
Italian: Canapino pallido occidentale
Lithuanian: Šviesioji tošinuk?
Norwegian: Maurersanger

Polish: zaganiacz p?owy
Portuguese: felosa-pálida
Slovak: sedmohlások širokozobý
Spanish: Zarcero Bereber
Swedish: macchiasångare

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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