Data Zone
Taxonomic source(s)
AERC TAC. 2003. AERC TAC Checklist of bird taxa occurring in Western Palearctic region, 15th Draft. Available at: http://www.aerc.eu/DOCS/Bird_taxa_of_the_WP15.xls.
Cramp, S. and Simmons, K.E.L. (eds). 1977-1994. Handbook of the birds of Europe, the Middle East and Africa. The birds of the western Palearctic. Oxford University Press, Oxford.
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | - |
| Year | Category | Criteria |
|---|---|---|
| 2024 | Least Concern | |
| 2016 | Least Concern | |
| 2013 | Least Concern | |
| 2012 | Least Concern | |
| 2009 | Least Concern | |
| 2008 | Least Concern | |
| 2004 | Least Concern | |
| 2000 | Lower Risk/Least Concern | |
| 1994 | Lower Risk/Least Concern | |
| 1988 | Lower Risk/Least Concern |
| Migratory status | full migrant | Forest dependency | medium |
| Land-mass type | Average mass | - |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence (breeding/resident) | 23,100,000 km2 | |
| Extent of Occurrence (non-breeding) | 22,200,000 km2 | |
| Severely fragmented? | no | - |
| Estimate | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| Population size | 236000000-358000000 mature individuals | poor | estimated | 2018 |
| Population trend | decreasing | - | suspected | - |
| Generation length | 2.4 years | - | - | - |
Population justification: In Europe, the total population size is estimated at 106,000,000-161,000,000 mature individuals, with 53,300,000-80,300,000 breeding pairs (BirdLife International 2021), and comprises approximately 45% of the species' global range, so a very preliminary estimate of the global population size is between 236,000,000-358,000,000 mature individuals, although further validation of this estimate is desirable. In Europe, the species' population is considered to have undergone a small decline over three generations (10 years) (BirdLife International 2021). Based on these data, and the proportion of the species' global range that this region holds, the global population size is considered to be decreasing slowly over three generations. This species is considered to have a medium dependency on forest habitat, which is estimated to be declining at a slow rate within its mapped range (Global Forest Watch 2024).
Trend justification: .
| Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
|---|---|---|---|---|---|---|
| Afghanistan | extant | uncertain | ||||
| Albania | extant | native | yes | |||
| Algeria | extant | native | ||||
| Andorra | extant | native | ||||
| Angola | extant | native | ||||
| Armenia | extant | native | ||||
| Austria | extant | native | yes | |||
| Azerbaijan | extant | native | ||||
| Bahrain | extant | native | yes | |||
| Belarus | extant | native | yes | |||
| Belgium | extant | native | yes | |||
| Benin | extant | native | ||||
| Bosnia and Herzegovina | extant | native | ||||
| Botswana | extant | native | ||||
| Bulgaria | extant | native | yes | |||
| Burkina Faso | extant | native | ||||
| Burundi | extant | native | ||||
| Cameroon | extant | native | ||||
| Canada | extant | vagrant | ||||
| Cape Verde | extant | native | ||||
| Central African Republic | extant | native | ||||
| Chad | extant | native | ||||
| Comoros | extant | vagrant | ||||
| Congo | extant | native | ||||
| Congo, The Democratic Republic of the | extant | native | ||||
| Côte d'Ivoire | extant | native | ||||
| Croatia | extant | native | yes | |||
| Cyprus | extant | native | ||||
| Czechia | extant | native | yes | |||
| Denmark | extant | native | yes | yes | ||
| Djibouti | extant | native | ||||
| Egypt | extant | native | ||||
| Equatorial Guinea | extant | native | ||||
| Eritrea | extant | native | ||||
| Estonia | extant | native | yes | |||
| Eswatini | extant | native | ||||
| Ethiopia | extant | native | ||||
| Faroe Islands (to Denmark) | extant | native | yes | |||
| Finland | extant | native | yes | yes | ||
| France | extant | native | yes | |||
| Gabon | extant | native | ||||
| Gambia | extant | native | ||||
| Georgia | extant | native | yes | |||
| Germany | extant | native | yes | yes | ||
| Ghana | extant | native | ||||
| Gibraltar (to UK) | extant | native | ||||
| Greece | extant | native | yes | yes | ||
| Greenland (to Denmark) | extant | vagrant | ||||
| Guinea | extant | native | ||||
| Guinea-Bissau | extant | native | ||||
| Hungary | extant | native | yes | |||
| Iceland | extant | native | ||||
| India | extant | vagrant | ||||
| Iran, Islamic Republic of | extant | native | yes | |||
| Iraq | extant | native | yes | |||
| Ireland | extant | native | yes | |||
| Israel | extant | native | ||||
| Italy | extant | native | yes | |||
| Japan | extant | vagrant | ||||
| Jordan | extant | native | yes | |||
| Kazakhstan | extant | native | yes | |||
| Kenya | extant | native | ||||
| Kuwait | extant | native | yes | |||
| Latvia | extant | native | yes | |||
| Lebanon | extant | native | yes | |||
| Lesotho | extant | native | ||||
| Liberia | extant | native | ||||
| Libya | extant | native | ||||
| Liechtenstein | extant | native | yes | |||
| Lithuania | extant | native | yes | |||
| Luxembourg | extant | native | yes | |||
| Malawi | extant | native | ||||
| Mali | extant | native | ||||
| Malta | extant | native | ||||
| Mauritania | extant | native | ||||
| Moldova | extant | native | yes | |||
| Monaco | extant | native | ||||
| Montenegro | extant | native | ||||
| Morocco | extant | native | ||||
| Mozambique | extant | native | ||||
| Namibia | extant | native | ||||
| Netherlands | extant | native | yes | |||
| Niger | extant | native | ||||
| Nigeria | extant | native | ||||
| North Macedonia | extant | native | yes | |||
| Norway | extant | native | yes | |||
| Oman | extant | native | yes | |||
| Poland | extant | native | yes | |||
| Portugal | extant | native | yes | |||
| Qatar | extant | native | yes | |||
| Romania | extant | native | yes | |||
| Russia | extant | native | yes | |||
| Russia (Asian) | extant | native | yes | |||
| Russia (Central Asian) | extant | native | yes | |||
| Russia (European) | extant | native | yes | |||
| Rwanda | extant | native | ||||
| Saudi Arabia | extant | native | yes | |||
| Senegal | extant | native | ||||
| Serbia | extant | native | ||||
| Seychelles | extant | vagrant | ||||
| Sierra Leone | extant | native | ||||
| Slovakia | extant | native | yes | |||
| Slovenia | extant | native | yes | |||
| Somalia | extant | native | ||||
| South Africa | extant | native | ||||
| South Sudan | extant | native | yes | |||
| Spain | extant | native | yes | |||
| St Helena (to UK) | extant | vagrant | ||||
| Sudan | extant | native | ||||
| Svalbard and Jan Mayen Islands (to Norway) | extant | vagrant | ||||
| Sweden | extant | native | yes | |||
| Switzerland | extant | native | yes | |||
| Syria | extant | native | yes | |||
| Tajikistan | extant | native | ||||
| Tanzania | extant | native | ||||
| Togo | extant | native | ||||
| Tunisia | extant | native | ||||
| Türkiye | extant | native | yes | |||
| Turkmenistan | extant | native | yes | |||
| Uganda | extant | native | ||||
| Ukraine | extant | native | yes | yes | ||
| United Arab Emirates | extant | native | yes | |||
| United Kingdom | extant | native | yes | |||
| Western Sahara | extant | native | ||||
| Yemen | extant | native | yes | |||
| Zambia | extant | native | ||||
| Zimbabwe | extant | native |
| Country/Territory | IBA Name |
|---|
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Artificial/Terrestrial | Arable Land | suitable | non-breeding |
| Artificial/Terrestrial | Rural Gardens | major | non-breeding |
| Forest | Boreal | suitable | breeding |
| Forest | Subtropical/Tropical Mangrove Vegetation Above High Tide Level | suitable | non-breeding |
| Forest | Subtropical/Tropical Moist Lowland | suitable | non-breeding |
| Forest | Subtropical/Tropical Moist Montane | suitable | non-breeding |
| Forest | Temperate | major | breeding |
| Grassland | Subtropical/Tropical Dry | suitable | non-breeding |
| Savanna | Dry | suitable | non-breeding |
| Shrubland | Subtropical/Tropical Dry | suitable | non-breeding |
| Wetlands (inland) | Bogs, Marshes, Swamps, Fens, Peatlands | suitable | non-breeding |
| Wetlands (inland) | Permanent Freshwater Lakes (over 8ha) | suitable | non-breeding |
| Altitude | 0 - 1000 m | Occasional altitudinal limits |
| Purpose | Scale |
|---|---|
| Pets/display animals, horticulture | international |
| Sport hunting/specimen collecting | subsistence, national |
Recommended citation
BirdLife International (2024) Species factsheet: Willow Warbler Phylloscopus trochilus. Downloaded from
https://datazone.birdlife.org/species/factsheet/willow-warbler-phylloscopus-trochilus on 25/11/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from
https://datazone.birdlife.org/species/search on 25/11/2024.