By Andreas Trepte - Own work, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=16110223
BlackcapSoundBy photo taken by Jakub Stančo, - Transferred from cs.wikipedia to Commons., CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=1772963
Black Headed Gull (summer)SoundBy © Hans Hillewaert /, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=5548312
Blue Tit SoundBy Charlesjsharp - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=32200901
ChaffinchBy Andreas Trepte - Own work, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=15264293
Chiffchaff  
Coal TitSoundBy Aviceda - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=6615397
Collared DoveCollared DoveSongBy Horia Varlan - originally posted to Flickr as Eurasian Collared Doves preparing to take flight, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=8968629
Common GullSoundPublic Domain, https://commons.wikimedia.org/w/index.php?curid=251972
CrowSongCC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=83387
DunnockSongBy Smalljim - Own work, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=3828054
FieldfareFieldfareBy Adam Kumiszcza - Own work, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=71477
GoldcrestSongBy Regulus_regulus_60North.jpg: Cj Hughson from Shetland derivative work: Bogbumper (Regulus_regulus_60North.jpg) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons
GoldfinchSongBy © Francis C. Franklin / CC-BY-SA-3.0, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=31627034
Great TitBy © Francis C. Franklin / CC-BY-SA-3.0, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=35923539
Greater Spotted WoodpeckerSongBy Steffen Hannert - Bearbeitete Version von Image:Buntspecht_Dendrocopos_major.jpg durch Jonathan HaasSteffen Hannert – "aufgenommen mit einer Nikon F5 und einem 4.0/500 P Objektiv Fuji Sensia 100; Blitz"Vogelruf.de, BirdGallery, http://www.vogelruf.de/galerie/ first upload in de wikipedia on 21:34, 19. May 2004 by Franz Xaver, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=3223008
GreenfinchSongBy Charlesjsharp - Own work, from Sharp Photography, sharpphotography, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=31663798
Green WoodpeckerBy RO_B_Carol_Park_green_woodpecker.jpg: Andrei Stroederivative work: Amada44 talk to me - RO_B_Carol_Park_green_woodpecker.jpg, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=12066619
HeronNo attribution
Herring GullSongBy Kulac - Self-published work by Kulac, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=2303577
House MartinSongBy Ómar Runólfsson - House Martin - Delichon urbicum - BæjasvalaUploaded by Snowmanradio, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=15386325
JackdawSongBy Maxwell Hamilton from Greater London, England United Kingdom - Flickr, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=15947286
JaySongBy I, Luc Viatour, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=5933620
Lesser Black Backed GullSongBy Andreas Trepte - Own work, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=723467
Little OwlSongBy Arturo Nikolai from Galicia, Spain - Flickr, CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=3969785
Long Tailed TitSongBy © Francis C. Franklin / CC-BY-SA-3.0, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=31139558
MagpieSongBy Pierre-Selim - Flickr: Pica pica, CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=19400996
MallardSongBy This picture was realized by Richard Bartz by using a Canon EF 70-300mm f/4-5.6 IS USM Lens - Own work, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=6449086
Mistle Thrush
Mistle ThrushSongBy Yuriy75 - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=8897506
NuthatchSongBy I, Luc Viatour, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=4977083
Pied WagtailPied WagtailSongCC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=12483
PigeonSongBy J.M.Garg - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=3048799
RavenRavenSongBy Diliff - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=26413439
RedwingSongBy Andreas Trepte - Own work, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=1907996
RobinSongBy Charlesjsharp - Own work, from Sharp Photography, sharpphotography, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=31916597
RookSongBy Brian Snelson from Hockley, Essex, England - Mmmm, tasty!Uploaded by Snowmanradio, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=11973245
SparrowhawkSongBy Pierre Dalous - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=27184634
Song ThrushSongBy Andreas Trepte - Own work, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=22435708
SwallowSongBy I, Malene, CC BY 2.5, https://commons.wikimedia.org/w/index.php?curid=20612
Mute SwanSongBy Charlesjsharp - Own work, from Sharp Photography, sharpphotography, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=31574944
SwiftSongBy pau.artigas - Falciot #2Uploaded by Snowmanradio, CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=10187946
Tawny OwlSongPublic Domain, https://commons.wikimedia.org/w/index.php?curid=111300
Tree CreeperSongBy Paweł Kuźniar (Jojo_1, Jojo) - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=955836
WoodpigeonSongBy Tristan Ferne from UK - Our woodpigeonUploaded by Snowmanradio, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=6973300
WrenSongBy Andreas Trepte - Own work, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=22796287
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