Brian Bevan / Pair of Reed warblers (Acrocephalus scirpaceus) feeding young at nest, Bedfordshire, England, UK, July.

Bence Mate / Little bittern (Ixobrychus minutus) watching Great warbler (Acrocephalus arundinaceus) with prey, Lake Csaj, Kiskunsagi National Park, Hungary.

Bence Mate / Great reed warbler (Acrocephalus arundinaceus) feeding Cuckoo chick (Cuculus canorus) Pusztaszer, Kiskunsagi National Park, Hungary, June.

David Tipling / 2020VISION / Reed warbler (Acrocephalus scirpaceus) with twelve day old Cuckoo (Cuculus canorus) chick at nest, Norfolk, England, UK, May

Markus Varesvuo / Great Reed Warbler (Acrocephalus arundinaceus) singing in reed bed. Estonia. June

Bence Mate / Common cuckoo chick (Cuculus canorus) begging for food from Great reed warbler (Acrocephalus arundinaceus) foster parent, Pusztaszer, Kiskunsagi National Park, Hungary

David Tipling / 2020VISION / Cuckoo (Cuculus canorus) 12 day chick in Reed Warbler nest (Acrocephalus scirpaceus) fed by Reed warbler, Fenland, Norfolk, UK, May

Chris Gomersall / 2020VISION / Reed warbler (Acrocephalus scirpaceus) adult perched in reedbed, Titchwell RSPB reserve, Norfolk, UK, April.

Chris Gomersall / 2020VISION / Sedge warbler (Acrocephalus schoenobaenus) adult singing in reedbed, Cambridgeshire, UK, May

Bence Mate / Great reed warbler (Acrocephalus arundinaceus) taking fish from water, Hungary, June. Winner, Eric Hosking award, 2011 Wildlife Photographer of the Year competition

Andy Sands / European Cuckoo chick (Cuculus canorus) being fed by Reed Warbler on post, West Sussex, England, UK

Wild Wonders of Europe / Wothe / Great reed warbler (Acrocephalus arundinaceus) perched on reed, singing, Eastern Slowakia, Europe, June 2009