Paul Hobson / Sedge warbler (Acrocephalus schoenobaenus) male singing whilst perched on Willow (Salix sp) branch. Sheffield, England, UK. May.

Loic Poidevin / Willow warbler (Phylloscopus trochilus) perched, Marais Breton, Vendee, France, August

Konrad Wothe / Willow warbler (Phylloscopus trochilus) singing, Bavaria, Germany. April

Konrad Wothe / Willow warbler (Phylloscopus trochilus) singing, Bavaria, Germany. April

Konrad Wothe / Willow warbler (Phylloscopus trochilus) singing, Bavaria, Germany. April

Konrad Wothe / Male Willow warbler (Phylloscopus trochilus) singing, Bavaria, Germany, April.

Dave Bevan / Willow warbler (Phylloscopus trochilus) approaching nest site in Bluebells (Hyacinthoides non-scripta), Carmarthenshire, Wales, UK, May.

Dave Bevan / Slow motion clip of a Willow warbler (Phylloscopus trochilus) entering nest site amongst Bluebells (Hyacinthoides non-scripta), Carmarthenshire, Wales, UK, May.

Konrad Wothe / Willow warbler (Phylloscopus trochilus) Bavaria, Germany, April.

Andy Sands / Willow Warbler (Phylloscopus trochilus) Perched on Hawthorn bush, Bedfordshire, England, UK, April

Andy Sands / Willow Warbler (Phylloscopus trochilus) singing from dead tree stump, Bedfordshire, England, UK, April

Andy Sands / Willow Warbler (Phylloscopus trochilus) Perched on dead tree stump, Bedfordshire, England, UK, April

Dave Bevan / Slow motion clip of a pair of Willow warblers (Phylloscopus trochilus) bringing food to chicks in nest in grass and brambles, Carmarthenshire, UK, June.

Paul Hobson / Willow warbler (Phyloscopus trochilus) perched on Red campion flowers, Wales, UK, April.

SCOTLAND: The Big Picture / Willow warbler (Phylloscopus trochilus) juvenile at garden pond, Scotland, UK, July.

Andy Trowbridge / Willow warbler (Phylloscopus trochilus) perched on a branch, Dovrefjell National Park, Norway, June.

Andy Trowbridge / Willow warbler (Phylloscopus trochilus) perched on branch, singing, Dovrefjell National Park, Norway, June.

Andy Trowbridge / Willow warbler (Phylloscopus trochilus) perched on branch, singing, Dovrefjell National Park, Norway, June.

Andy Trowbridge / Willow warbler (Phylloscopus trochilus) perched on a branch, Dovrefjell National Park, Norway, June.

Andy Trowbridge / Willow warbler (Phylloscopus trochilus) perched on a branch, singing, Dovrefjell National Park, Norway, June.

Andy Trowbridge / Willow warbler (Phylloscopus trochilus) perched on a branch, Dovrefjell National Park, Norway, June.

David Tipling / Willow warbler (Phylloscopus trochilus) perched, The Flow Country, Sutherland and Caithness, Scotland, UK, April.

David Tipling / Willow warbler (Phylloscopus trochilus) rear view, The Flow Country, Sutherland and Caithness, Scotland, UK, April.

David Tipling / Willow warbler (Phylloscopus trochilus) singing, The Flow Country, Sutherland and Caithness, Scotland, UK, April.

David Tipling / Willow warbler (Phylloscopus trochilus) The Flow Country, Sutherland and Caithness, Scotland, UK, April.

Ole Jorgen Liodden / Willow warbler (Phylloscopus trochilus acredula) on moss, Norway, May.

Jussi Murtosaari / Willow warbler (Phylloscopus trochilus) Laukaa, Keski-Suomi, Lansi- ja Sisa-Suomi / Central and Western Finland, Finland. September

Pal Hermansen / Willow warbler ( Phylloscopus trochilus) feeding young on car steering wheel in car graveyard, Bastnas, Vastmanland, Sweden, June.

Markus Varesvuo / Willow warbler (Phylloscopus trochilus) portrait, Uto, Finland, May.

Robin Chittenden / Willow Warbler (Phylloscopus trochilus) Portugal, October.

Robin Chittenden / Willow Warbler (Phylloscopus trochilus) Portugal, October.

Flip de Nooyer / Willow warbler with nest material {Phylloscopus trochilus} Europe

Robin Chittenden / Willow warbler (Phylloscopus trochilus) perched in bush, Algarve, Portugal. October.

Robin Chittenden / Willow warbler (Phylloscopus trochilus) perched on branch, Algarve, Portugal. October.

Robin Chittenden / Willow warbler (Phylloscopus trochilus) juvenile, perched on branch, Norfolk, UK. September.

Ashley Cooper / Sedge warbler (Acrocephalus schoenobaenus) perched in a Willow tree (Salix sp) and singing, Ambleside, Lake District, UK.

Konrad Wothe / Willow warbler (Phylloscopus trochilus) perched in tree top singing, Bavaria, Germany. June.

Pal Hermansen / Willow warbler (Phylloscopus trochilus) chick perched and begging for food. Adult bird lands on the perch and feeds the chick then leaves the frame, Car Graveyard, Bilkyrkogarden Kyrko Mosse, Sweden.

Laurie Campbell / Male Willow warbler (Phylloscopus trochilus) perched at top of juniper bush, singing, Inverness-shire, Scotland, UK. May.

Mike Potts / Willow Warbler (Phylloscopus trochilus) in reedbed with a damselfly larva in its beak, RSPB Conwy Reserve, North Wales, May.

Markus Varesvuo / Chiffchaff (Phylloscopus trochilus) perched on branch. Uto, Finland. October.

Erlend Haarberg / Willow warbler (Phylloscopus trochilus). Pasvik, Norway. May.

Oscar Dewhurst / Willow warbler (Phylloscopus trochilus) perched on lichen-covered branch. Durham, UK. May.