The western Bonelli's warbler (Phylloscopus bonelli) is named after Italian ornithologist Franco Andrea Bonelli (1784-1830). During his time as professor of zoology at Turin university, he formed one of the largest ornithological collections in Europe. As with most warblers, the sexes are identical – plain grey-green back, green-toned rump and wings and whitish underparts. A shy bird of forest and woodland, it breeds in southwest Europe and north Africa.
The Eastern Bonelli's warbler (Phylloscopus orientalis) breeds in southeast Europe and Asia Minor, The two do not overlap.