Marie Read / Red-winged Blackbird (Agelaius phoeniceus) male displaying in cattail marsh, Viera Wetlands, Brevard County, Florida, USA, January.

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

Donald M. Jones / Yellow-headed Blackbird (Xanthocephalus xanthocephalus) male calling, Montana

Donald M. Jones / Western Meadowlark (Sturnella neglecta) male calling, Montana

Hermann Brehm / Nightingale (Luscinia megarhynchos ) singing, Germany, April.

Tomasz Zawadzki/ BIA / Blue-headed Wagtail (Motacilla flava) calling, Poland

Tomasz Zawadzki/ BIA / Great Reed-Warbler (Acrocephalus arundinaceus) calling, Poland

Glenn Bartley/ BIA / Patagonian Sierra-Finch (Phrygilus patagonicus) male calling, Andes, Chile

Dave Bevan / Male Pied flycatcher (Ficedula hypoleuca) calling to establish territory and attract a mate, Carmarthenshire, Wales, UK, May.

Konrad Wothe / Male Blackbird (Turdus merula) singing, Bavaria, Germany, April.

Guy Edwardes / Little bee-eater (Merops pusillus) vocalising whilst perched on branch, Khwai, Botswana.

Scott Leslie / Black-and-white Warbler (Mniotilta varia) male calling in spring, Maine