Paul Hobson / Wood warbler (Phylloscopus sibilatrix) singing whilst perched on branch, silhouetted at dawn. Sheffield, England, UK. May.

Paul Hobson / Wood warbler (Phylloscopus sibilatrix) male singing, perched on branch in morning light. Sheffield, England, UK. May.

Bruno D'Amicis / Wood warbler (Phylloscopus sibilatrix) singing on tree branch in old-growth Beech (Fagus sylvatica) forest. UNESCO World Heritage Site. Abruzzo, Lazio and Molise National Park, Italy. June

Dave Bevan / Wood warbler (Phylloscopus sibilatrix) displaying and calling from the branches of an Oak tree (Quercus), Carmarthenshire, Wales, UK, May.

Dave Bevan / Wood warbler (Phylloscopus sibilatrix) displaying, Carmarthenshire, Wales, UK, May.

Andres M. Dominguez / Wood warbler (Phylloscopus sibilatrix) with insect prey, Andalusia, Spain, August.

Fabrice Cahez / Wood warbler (Phylloscopus sibilatrix) singing, silhouetted, Vosges, France, May.

Fabrice Cahez / Wood warbler (Phylloscopus sibilatrix) Vosges, France, May.

Fabrice Cahez / Wood warbler (Phylloscopus sibilatrix) Vosges, France, May.

Paul Hobson / Wood warbler (Phylloscopus sibilatrix) in canopy, Derbyshire, England, UK, May.

Paul Hobson / Wood warbler (Phylloscopus sibilatrix) displaying to a rival in canopy, Derbyshire, England, UK, May.

Paul Hobson / Wood warbler (Phylloscopus sibilatrix) singing male in canopy, Derbyshire, England, UK, May.