Bence Mate / Great reed warbler (Acrocephalus arundinaceus) feeding Cuckoo chick (Cuculus canorus) Pusztaszer, Kiskunsagi National Park, Hungary, June.
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Bence Mate / Common cuckoo chick (Cuculus canorus) begging for food from Great reed warbler (Acrocephalus arundinaceus) foster parent, Pusztaszer, Kiskunsagi National Park, Hungary
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Paul Hobson / Reed warbler (Acrocephalus scirpaceus) vocalising whilst perched amongst reeds in morning light. Sheffield, England, UK. May.
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Paul Hobson / Reed warbler (Acrocephalus scirpaceus) perched on stem in morning light. Sheffield, England, UK. May.
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David Tipling / Cuckoo (Cuculus canorus) 12 day old chick in Reed Warblers (Acrocephalus scirpaceus) nest, Norfolk, England, UK. May.
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Matthew Maran / Reed warbler (Acrocephalus scirpaceus) being released after ringing, reedbeds on the Otter Estuary, Devon, England, UK, May.
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Matthew Maran / Bird ringer measuring migrant Reed warblers (Acrocephalus scirpaceus) in reedbeds, Otter Estuary, East Devon, England, UK, May.
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Matthew Maran / Man ringing migrant reed warblers (Acrocephalus scirpaceus) noting down details, in reedbeds on the Otter Estuary, East Devon, England, UK, May 2017.
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Matthew Maran / Ringing migrant reed warblers (Acrocephalus scirpaceus) in reedbeds on the Otter Estuary to improve understanding of their ecology and life cycle. Devon UK
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David Kjaer / Reed warbler (Acrocephalus scirpaceus) with insect larvae in beak, Greylake RSPB Reserve, Somerset Levels, England, UK, June.
Thomas Hinsche / Common Cuckoo (Cuculus canorus) chick and Eurasian Reed-Warbler (Acrocephalus scirpaceus), Saxony-Anhalt, Germany
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Thomas Hinsche / Eurasian Reed-Warbler (Acrocephalus scirpaceus) feeding Common Cuckoo (Cuculus canorus) chick, Saxony-Anhalt, Germany
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Thomas Hinsche / Eurasian Reed-Warbler (Acrocephalus scirpaceus) feeding Common Cuckoo (Cuculus canorus) chick, Saxony-Anhalt, Germany
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Mike Read / Great reed warbler (Acrocephalus arundinaceus) perched in Common reed (Phragmites australis) in marshland near Tiszaalpar, Hungary, June.
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Pal Hermansen / Reed warbler (Acrocepahlus scirpaceus) singing from reed, Varmland, Sweden, June
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David Tipling / Reed Warbler (Acrocephalus scirpaceus) feeding Cuckoo (Cuculus canorus) chick in reedbed nest, Norfolk, May.
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Nature Production / Common Cuckoo chick (Cuculus canorus) pushing Reed-warbler chick (Acrocephalus sp) out of host nest, Japan
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Wild Wonders of Europe / della Ferrera / Great reed warbler (Acrocephalus arundinaceus) singing amongst Common reeds (Phragmites australis) Hutovo Blato Nature Park, Bosnia and Herzegovina, May 2009
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Nature Production / Great Reed Warbler {Acrocephalus arundinaceus} pair with chicks at nest in Common Reeds {Phragmites communis} Shiga, Japan
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Rolf Nussbaumer / Male Great Reed Warbler (Acrocephalus arundinaceus) singing on Common Reed (Phragmites australis), Denja, Spain. May 1997
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Rolf Nussbaumer / Male Sedge Warbler (Acrocephalus schoenobaenus) singing on Common Reed (Phragmites australis), Illmitz, Lake of Neusiedl, Austria. May 1996
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Volker Lautenbach/ BIA / Common Cuckoo (Cuculus canorus) chick being fed by Eurasian Reed-Warbler (Acrocephalus scirpaceus), Saxony-Anhalt, Germany
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Nature Production / Common Cuckoo {Cuculus canorus} fledgling, 15 days old, being fed by Great Reed Warbler {Acrocephalus arundinaceus} Nagano, Japan, August
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Robin Chittenden / Reed warbler (Acrocephalus scirpaceus) perched among reeds, Norfolk, England, UK. June.
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Roger Powell / Common chiffchaff (Phylloscopus collybita) perched on a reed stem over water, Riet Vell Reserve, Ebro Delta Reserve, Catalonia, Spain. January.
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Nick Upton / Reed warbler (Acrocephalus scirpaceus) perched with beakful of Common reed (Phragmites australis) flowers to line nest with, Gloucestershire, UK, June.
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David Tipling / Reed warbler (Acrocephalus scirpaceus), adult feeding fledged chicks in reeds, North Norfolk, UK. June.
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David Tipling / Reed warbler (Acrocephalus scirpaceus), adult feeding fledged chicks in reeds, North Norfolk, UK. June.
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Robin Chittenden / Reed warbler (Acrocephalus scirpaceus) perched on reed, Whitlingham CP Norwich UK, May.
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Robin Chittenden / Reed warbler (Acrocephalus scirpaceus) singing, perched on a branch, Whitlingham CP Norwich UK, May.
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Robin Chittenden / Reed Warbler (Acrocephalus scirpaceus) Norfolk, England, UK.September.
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David Tipling / Reed Warbler (Acrocephalus scirpaceus) feeding damselfly to Cuckoo chick (Cuculus canorus) age 12 days, in nest, Norfolk, May
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David Perpinan / Slow motion shot of Reed warbler (Acrocephalus scirpaceus) in a mist net, Ebro Delta, Tarragona, Spain, June.
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David Perpinan / Slow motion shot of Reed warbler (Acrocephalus scirpaceus) being released and flying out of human hands, Ebro Delta, Tarragona, Spain, June.
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David Perpinan / Reed warbler (Acrocephalus scirpaceus) with a geologger attached on its back, Ebro Delta, Tarragona, Spain, June.
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David Perpinan / Reed warbler (Acrocephalus scirpaceus) with a geologger, Ebro Delta, Tarragona, Spain, June.
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David Perpinan / Operator placing geologger on a Reed warbler (Acrocephalus scirpaceus), Ebro Delta, Tarragona, Spain, June.
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David Perpinan / Operator placing geologger on a Reed warbler (Acrocephalus scirpaceus), Ebro Delta, Tarragona, Spain, June.
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David Perpinan / Operator placing geologger on a Reed warbler (Acrocephalus scirpaceus), Ebro Delta, Tarragona, Spain, June.
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David Perpinan / Man removing Reed warbler (Acrocephalus scirpaceus) from mist net, Ebro Delta, Tarragona, Spain, June.
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David Perpinan / Man removing Reed warbler (Acrocephalus scirpaceus) from mist net, Ebro Delta, Tarragona, Spain, June.
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David Perpinan / Reed warbler (Acrocephalus scirpaceus) in mist net, Ebro Delta, Tarragona, Spain, June.
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David Perpinan / Reed warbler (Acrocephalus scirpaceus) in mist net, Ebro Delta, Tarragona, Spain, June.
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David Perpinan / Reed warbler (Acrocephalus scirpaceus) in mist net, Ebro Delta, Tarragona, Spain, June.
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David Perpinan / Reed warbler (Acrocephalus scirpaceus) caught in mist net, Ebro Delta, Tarragona, Spain, June.
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David Perpinan / Male Reed warbler (Acrocephalus scirpaceus) singing on top of reed, Cuenca, Spain, March.
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David Perpinan / Male Reed warbler (Acrocephalus scirpaceus) singing on reed, Cuenca, Spain, March.
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David Perpinan / Male Reed warbler (Acrocephalus scirpaceus) singing on top of reed, Cuenca, Spain, March.
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Brian Bevan / Reed warbler (Acrocephalus scirpaceus) building nest, Bedfordshire, UK, June.
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Mick Jenner / Reed Warbler (Acrocephalus scirpaceus) perched on a reed stem and singing, England, UK, May.