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 4,800,000-6,360,000 mature individuals, with 2,400,000-3,180,000 breeding pairs (BirdLife International 2021), and comprises approximately 75% of the species' global range, so a very preliminary estimate of the global population size is between 6,400,000-8,480,000 mature individuals, although further validation of this estimate is desirable. The species' population in Europe is considered to have undergone a rapid increase over three generations (10 years) (BirdLife International 2021). As this region holds the vast majority of the species' global range, the global population size is considered to be increasing over three generations.
Trend justification
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During the breeding season this species inhabits warm deciduous woodland comprising oak Quercus, birch Betula, beech Fagus and sweet chestnut Castanea, together with a mixture of other deciduous trees as well as pine Pinus, spruce Picea or larch Larix, and with a good ground layer of vegetation. It is also common in cork oak Q. suber and cedar woodland around the Mediterranean. In the west of its range it breeds in pine and oak scrub with undergrowth of bramble Rubus fruticosus, barberry Berberis or juniper Juniperus. In the African non-breeding range it is found in open woodland and thickets in dry steppe, bushy savanna and oases with acacia scrub. Breeding occurs from the end of April until August. The nest is a dome-shaped ball made mostly of grasses, with some leaves, moss and hair. It is well concealed on the ground, usually on a bank and beneath overhanging vegetation, fallen tree or branches. Clutches are four to six eggs. It feeds on insects and other invertebrates. The species is migratory, wintering in a narrow belt along the southern edge of Sahara (Clement and Christie 2015).
This species is likely to be negatively affected by intensive management and overexploitation of woodlands (Correia et al. 2014).
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
Increases in tree diversity can improve habitat suitability for this species (Pereira et al. 2014).
Text account compilers
Rutherford, C.A., Martin, R.
Recommended citation
BirdLife International (2024) Species factsheet: Western Bonelli's Warbler Phylloscopus bonelli. Downloaded from
https://datazone.birdlife.org/species/factsheet/western-bonellis-warbler-phylloscopus-bonelli on 22/12/2024.
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 22/12/2024.