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Taxonomic note

Phylloscopus trochiloides, P. nitidus and P. plumbeitarsus (del Hoyo and Collar 2016) were previously lumped as P. trochiloides (see AERC TAC [2003]; Cramp et al. [1977–1994]; Sibley and Monroe [1990, 1993]).

Taxonomic source(s)
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.

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.

Recommended citation
BirdLife International (2025) Species factsheet: Greenish Warbler Phylloscopus trochiloides. Downloaded from https://datazone.birdlife.org/species/factsheet/greenish-warbler-phylloscopus-trochiloides on 14/01/2025.
Recommended citation for factsheets for more than one species: BirdLife International (2025) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 14/01/2025.