Western Bonelli's Warbler

Phylloscopus bonelli

The western Bonelli's warbler is a warbler in the leaf warbler genus Phylloscopus. It was formerly regarded as the western subspecies of a wider "Bonelli's warbler" species, but as a result of modern taxonomic developments, they are now usually considered to be two species:Western Bonelli's warbler, Phylloscopus bonelli, which breeds in southwest Europe and north Africa Eastern Bonelli's warbler, Phylloscopus orientalis, which breeds in southeast Europe and Asia Minor Source

Where it is now

In the last 8 weeks this bird was recorded 129 times across 10 areas (each area is a 5 degree square).

See the Western Bonelli's Warbler on the live map

Movement and weather

Each season it is first heard regularly where daytime highs are around 17°C (typically 16 to 20°C, from 8 areas). That holds across 20° of latitude, which suggests its timing follows temperature more than the calendar.

Arrival dates

The week it was first heard regularly in each region, after at least six weeks away. Dates differ from south to north, so a region has a range.

Download every area as CSV

Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured and how it compares with human observers.