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.

Winfried Wisniewski / Willow Warbler (Phylloscopus trochilus), Norway

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.