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 stable, 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 4,080,000-6,550,000 mature individuals, with 2,040,000-3,280,000 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 9,070,000-14,600,000 mature individuals, although further validation of this estimate is desirable. In Europe, the species' population is considered to have remained relatively stable over three generations (10 years) (BirdLife International 2021) following its northward range expansion (Keller et al. 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 stable over three generations.
Trend justification
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This species favours swampy lowland areas with thick cover of reeds and sparse bushes (rarely in uniform reedbeds standing in water), willows (Salix), and brambles (Rubus) or blackthorn (Prunus spinosa). It is also found in overgrown ditches and streams with thick tangles of cover, areas of damp meadows, tall grass stands, hedgerows and overgrown orchards. In non-breeding areas, occurs in variably wet or dry scrub of plains, foothills, valley bottoms, bramble patches, overgrown orchards, and dense cover near water, marshes, swamps and reeds (Clement 2006). Breeding occurs mainly from mid-April to July/August. It lays two to four eggs. The nest is a large untidy cup of leaves, dry grass, plant fibres, feathers, animal hair and reed mace (Typha). It can be sited up to two metres from the ground in a thick tangle of vegetation, among the twigs or thin branches of a bush or stems of reeds or nettles (Urtica) (Clement 2006). It feeds mainly on insects but also takes other invertebrates. The species varies from sedentary to migratory in different parts of its range (Snow and Perrins 1998).
Particularly in the north-west of its range, it is susceptible to severe cold winters (Hagemeijer and Blair 1997, Robinson et al. 2007).
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 Europe.
Text account compilers
Rutherford, C.A., Martin, R.
Recommended citation
BirdLife International (2024) Species factsheet: Cetti's Warbler Cettia cetti. Downloaded from
https://datazone.birdlife.org/species/factsheet/cettis-warbler-cettia-cetti on 22/11/2024.
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 22/11/2024.