David Kjaer / Sedge warbler (Acrocephalus schoenobaenus) singing, Greylake RSPB Reserve, Somerset Levels, England, UK, May.

Michel Poinsignon / Sedge warbler (Acrocephalus schoenobaenus) adult singing in reedbed. Baie de Somme. France. April

Ingo Arndt / Sedge warbler (Acrocephalus schoenobaenus) male singing, sitting on reed stem, Lake Neusiedl, Austria , April.

Ingo Arndt / Sedge warbler (Acrocephalus schoenobaenus) male singing, sitting on reed stem, Lake Neusiedl, Austria , April.

Ingo Arndt / Sedge warbler (Acrocephalus schoenobaenus) male singing, sitting on reed stem, Lake Neusiedl, Austria , April.

Loic Poidevin / Sedge warbler (Acrocephalus schoenobaenus) in bush. Le Teich , Gironde, France, September

Niall Benvie / Sedge warbler (Acrocephalus schoenobaenus) perched on Bracken singing, Islay, Scotland

Chris Gomersall / Sedge warbler (Acrocephalus schoenobaenus) singing with bokeh effect in background,Norfolk, England, UK, May. Winner of the Birds in Environment Category of the Bird Photographer of the Year 2015.

Sam Hobson / Sedge warbler (Acrocephalus schoenobaenus) caught in bird ringers nets. Severn Estuary, UK. July

Sam Hobson / Sedge warbler (Acrocephalus schoenobaenus) held in bird ringers hand. Severn Estuary, UK. July

Ingo Arndt / Sedge warbler (Acrocephalus schoenobaenus) singing in reedbed at sunset, Lake Neusiedl, Austria , April.

Ingo Arndt / Sedge Warbler (Acrocephalus schoenobaenus) male calling, Lake Neusiedl, Austria