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 800,000-1,010,000 mature individuals, with 400,000-502,000 breeding pairs (BirdLife International 2021), and comprises approximately 35% of the species' global range, so a very preliminary estimate of the global population size is between 2,290,000-2,890,000 mature individuals, although further validation of this estimate is desirable. In Europe, the species' population has increase over three generations (10 years) (BirdLife International 2021) as the species' westward range expansion has continued (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 increasing over three generations.
Trend justification
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This species is found in steppe with low scrub of spirea (Spiraea), pea species (Pisum) and similar species. In the temperate zone it occurs in overgrown pastureland and meadows with dense bushes and weeds. In the south of the range it overlaps with H. rama in semi-desert and breeds in the lowest scrub (Svensson 2006). Breeding occurs from May to early July. The nest is a well-built cup of twigs, roots, stems and leaves, lined with finer material including feathers, hair and plant down (Snow and Perrins 1998) and placed on or near ground, or up to 1m above it, in dense undergrowth. It feeds principally on insects and other invertebrates. The species is a long-distance migrant, wintering in India (Svensson 2006).
In some areas of Russia, nest predation by predators such as Common Viper (Vipera berus), Harriers and Corvids has a variable annual pressure but may have a significant impact locally (Shitikov et al. 2012).
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
Although this species is not threatened, further research into the impacts of predators may help inform future conservation measures.
Text account compilers
Martin, R., Rutherford, C.A.
Recommended citation
BirdLife International (2024) Species factsheet: Booted Warbler Iduna caligata. Downloaded from
https://datazone.birdlife.org/species/factsheet/booted-warbler-iduna-caligata on 26/11/2024.
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 26/11/2024.