Data Zone
Justification of Red List category
This species has an extremely large range and the population size is extremely large, hence does not approach threatened thresholds for the range or population size criteria. The population trend appears to be increasing, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion. For these reasons the species is evaluated as Least Concern.
Population justification
In Europe, the total population size is estimated at 8,080,000-15,300,000 mature individuals, with 4,040,000-7,630,000 breeding pairs (BirdLife International 2021), and comprises approximately 40% of the species' global range, so a very preliminary estimate of the global population size is between 20,200,000-38,300,000 mature individuals, although further validation of this estimate is desirable. In Europe, the species' population is considered to have undergone a suspected increase over three generations (10 years) (BirdLife International 2021) as its westward range expansion continues (Keller et a. 2020). Based on these data, and the proportion of the species' global range that this region holds, the global population size is considered to be increasing over three generations.
This species breeds in lowland and montane mixed birch (Betula) and conifer forests, also in broadleaf woods of beech (Fagus), maple (Acer) and lime (Tilia) interspersed with birch and pine (Pinus). It is also found in parks, gardens, riverine thickets and swamp-woodland with willows (Salix) and poplars (Populus). In central Asia it is also found in mixed taiga forests of fir (Abies), in the north-west Himalayas it is mainly found in oak (Quercus) forests, also juniper (Juniperus) and birch subalpine meadows with rhododendrons (Rhododendron) and in dwarf junipers or willows. In the north of the range it breeds in birch clumps and shrubs. The breeding season is from May to mid-August (Clement 2006). The nest is a large, domed structure with a side entrance and is made from grasses, plant fibres, moss, rootlets and leaves and is lined with finer material such as hair, fur, down and feathers. It is sited on the ground in tall vegetation or low scrub, under stones, windfall or tree roots and sometimes in a crevice in a bank, old wall or tree stump. Clutches are three to seven eggs (Snow and Perrins 1998). The diet is mostly small invertebrates but also takes fruits of elder (Sambucus) and some seeds. The species is migratory (Clement 2015).
There are not thought to be any current significant threats to this species within its European range.
Conservation Actions Underway
CMS Appendix II. Bern Convention Appendix II. There are currently no known conservation measures for this species within Europe.
Conservation Actions Proposed
No conservation measures are currently needed for this species within its European range.
Text account compilers
Martin, R., Rutherford, C.A.
Recommended citation
BirdLife International (2024) Species factsheet: Greenish Warbler Phylloscopus trochiloides. Downloaded from
https://datazone.birdlife.org/species/factsheet/greenish-warbler-phylloscopus-trochiloides on 14/12/2024.
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 14/12/2024.