Own work; for the pictures:

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  Seite 1: File:Cyanistes caeruleus -Norfolk, England -adult and chicks-8.jpg (https://www.flickr.com/photos/davepegz/5752858771/) Autor: Dave Howes from Aylsham, United Kingdom, Lizenz: CC BY-SA 2.0
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  Seite 3: File:Great_Tit_in_Finland.jpg (https://www.flickr.com/photos/36093266@N06/5314523845) Autor: Ari Helminen Lizenz: CC BY 2.0
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  Seite 3: File:Ekahau_Sinitiainen.jpg Autor: Toivo Toivanen & Tiina Toppila Lizenz: PD
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  Seite 4: File:ParusCaeruleusBathing.jpg Autor: Maximilian Dorsch Lizenz: CC BY-SA 3.0
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  Seite 4: File:Blue_Tit_(Cyanistes_caeruleus)_(5556622045).jpg (https://www.flickr.com/photos/anemoneprojectors/5556622045/) Autor: AnemoneProjectors Lizenz: CC BY-SA 2.0
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  Seite 5: File:Bird_on_Bike_-_geograph.org.uk_-_202475.jpg (https://www.geograph.org.uk/photo/202475) Autor: Cat Walsh Lizenz: CC BY-SA 2.0
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  Seite 5: File:Cyanistes_caeruleus,_blue_tit_mirror_fighting.jpg (https://www.flickr.com/photos/miikas/2357557581/) Autor: Miika Silfverberg Lizenz: CC BY-SA 2.0
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  Seite 6: File:Mésange_bleu_nichoir.JPG Autor: User:Ghislain38 Lizenz: CC BY-SA 3.0
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  Seite 6: File:2009-07-12-Nistkasten_(3).JPG Autor: User:R. Engelhardt Lizenz: CC BY-SA 3.0
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  Seite 6: File:I'm_coming_guys!.jpg (https://www.flickr.com/photos/22317744@N00/257729113) Autor: Angelo Rossi Lizenz: CC BY 2.0
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  Seite 7: File:Mesang099d.jpg Autor: User:Stabilizer Lizenz: CC BY-SA 3.0, GNU 1.2+
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  Seite 7: File:Cyanistes_caeruleus_1.JPG Autor: User:Aiwok Lizenz: CC BY-SA 3.0, CC BY-SA 2.5, CC BY-SA 2.0, CC BY-SA 1.0, GNU 1.2+
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  Seite 8: File:Parus_caeruleus_egg.JPG Autor: Arnstein Rønning Lizenz: CC BY-SA 3.0
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  Seite 8: File:Parus_caeruleus_nest.JPG Autor: Arnstein Rønning Lizenz: CC BY-SA 3.0
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  Seite 9: File:Blue_Tit_-Cyanistes_caeruleus_-inside_nest_box-4.jpg (https://www.flickr.com/photos/31855019@N05/2989882971) Autor: Flickr-User fs-phil Lizenz: CC BY-SA 2.0
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  Seite 9: File:Parus_caeruleus_children.JPG Autor: Arnstein Rønning Lizenz: CC BY-SA 3.0
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  Seite 10: File:Parus_caeruleus_auf_dem_Weg_zur_Winterfütterung.JPG Autor: User:4028mdk09 Lizenz: CC BY-SA 3.0
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  Seite 10: File:CyanistesCaeruleusWithForage.jpg Autor: Claus Fisser Lizenz: CC BY-SA 3.0
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  Seite 10: File:Sykora02.jpg Autor: User:Ladarozan Lizenz: CC BY-SA 3.0, GNU 1.2+
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  Seite 11: File:Blåmes_-_Cyanistes_caeruleus.jpg Autor: Jens Hunt Lizenz: CC BY-SA 3.0
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  Seite 11: File:Cyanistes_caeruleus_-Arras,_Nord-Pas-de-Calais,_France-8.jpg (https://www.flickr.com/photos/olibac/2501604718/) Autor: Olivier Bacquet from FRANCE Lizenz: CC BY 2.0
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  Seite 11: File:Blaumeise_mit_Futter_für_ihre_Jungen-1758.jpg Autor: Hedwig Storch Lizenz: CC BY-SA 3.0
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  Seite 12: File:20120607_041013_Side_w1.jpg Autor: User:Aroatw (Rognmo) Lizenz: CC BY-SA 3.0
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  Seite 12: File:Pimpelmees jongen (Parus caeruleus).jpg Autor: User:Rasbak Lizenz: CC BY-SA 3.0, GNU 1.2+
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  Seite 12: File:Sykory03.jpg Autor: User:Ladarozan Lizenz: CC BY-SA 3.0, GNU 1.2+
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  Seite 13: File:Cyanistes caeruleus -Norfolk, England -adult feeding chick-8.jpg (https://www.flickr.com/photos/davepegz/5753285126/) Autor: Dave Howes from Aylsham, United Kingdom Lizenz: CC BY-SA 2.0
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  Seite 13: File:Cyanistes caeruleus -Norfolk, England -adult feeding chick-8 (1).jpg (https://www.flickr.com/photos/davepegz/5752737713/) Autor: Dave Howes from Aylsham, United Kingdom Lizenz: CC BY-SA 2.0
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  Seite 14: File:Cyanistes caeruleus 2011-01.JPG Autor: User:Gerbil Lizenz: CC BY-SA 3.0, GNU 1.2+
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  Seite 14: File:Cyanistes caeruleus -Norfolk, England -chicks-8 (1).jpg (https://www.flickr.com/photos/davepegz/5753431790/) Autor: Dave Howes from Aylsham, United Kingdom Lizenz: CC BY-SA 2.0
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  Seite 15: File:Cat and blue tit.jpg Autor: Ilmari Karonen Lizenz: CC BY-SA 3.0, CC BY-SA 2.5, CC BY-SA 2.0, CC BY-SA 1.0, GNU 1.2+
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  Seite 15: File:Accipiter_nisus_with_Passer_domesticus.jpg (http://piqs.de/fotos/35477.html) Autor: Angie525A at piqs.de Lizenz: CC BY 2.0 DE
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  Seite 16: File:Nestjunge Blaumeise bei Gefiederpflege Juni 2012.JPG Autor: User:4028mdk09 Lizenz: CC BY-SA 3.0
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  Seite 16: File:Blaumeisenfütterung Juni 2012 Fulda.JPG Autor: User:4028mdk09 Lizenz: CC BY-SA 3.0
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  Seite 17: File:Cyanistes_caeruleus_-Norfolk,_England_-adult_feeding_chick-8_(4).jpg (https://www.flickr.com/photos/davepegz/5753307868/) Autor: Dave Howes from Aylsham, United Kingdom Lizenz: CC BY-SA 2.0
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  Seite 17: File:Blue_Tit_hanging_around_in_Chudleigh._-_geograph.org.uk_-_896369.jpg (https://www.geograph.org.uk/photo/896369) Autor: paul dickson Lizenz: CC BY-SA 2.0
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  Seite 18: File:Un_mésange_en_août_2009_-_2.JPG Autor: Laura Huyet Lizenz: CC BY-SA 3.0, CC BY-SA 2.5, CC BY-SA 2.0, CC BY-SA 1.0
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  Seite 18: File:Parus_caeruleus_auf_dem_Weg_zur_Winterfütterung.JPG Autor: User:4028mdk09 Lizenz: CC BY-SA 3.0
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  Seite 19: File:Reinhardswald_im_Mai.jpg Autor: User:Lebrac Lizenz: CC BY-SA 3.0, CC BY-SA 2.5, CC BY-SA 2.0, CC BY-SA 1.0, GNU 1.2+
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  Seite 19: File:Herrerillo_en_nido_(Parus_caeruleus)_Blue_tit_feeding_brood.jpg (https://www.flickr.com/photos/23868014@N05/3506255319) Autor: Flickr-User hhhalberto Lizenz: CC BY 2.0
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  Seite 21: File:Marsh_Tit_(Poecile_palustris)_(18).JPG Autor: Ken Billington Lizenz: CC BY-SA 3.0
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  Seite 21: File:Poecile_Montanus_Kittila_20120306.JPG Autor: User:Estormiz Lizenz: CC0 1.0
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  Seite 21: File:Great_Tit_(Parus_major)_1.jpg Autor: User:Darkone Lizenz: CC BY-SA 2.5
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  Seite 21: File:ParusCaeruleus.jpg Autor: Maximilian Dorsch Lizenz: CC BY-SA 3.0
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  Seite 21: File:Lophophanes_cristatus_-Aviemore,_Scotland-8_(2).jpg (https://www.flickr.com/photos/bird-tracker/5490488512/) Autor: Mark Medcalf Lizenz: CC BY 2.0
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  Seite 21: File:Svartmeis_pho.jpg Autor: Per Harald Olsen (User:Perhols) Lizenz: CC BY-SA 3.0
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  Seite 22: File:Parus_atricapillus_1_(Marek_Szczepanek).jpg Autor: Marek Szczepanek Lizenz: CC BY-SA 3.0, GNU 1.2+
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  Seite 22: File:Poecile_Montanus_Simo_20130803.JPG Autor: User:Estormiz Lizenz: CC0 1.0
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  Seite 22: File:Poecile_palustris_crop_2769.jpg Autor: User:Bogbumper Lizenz: CC BY-SA 3.0, GNU 1.2+
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  Seite 22: File:Sumpfmeise1.jpg (Vogelruf.de, BirdGallery, http://www.vogelruf.de/galerie/) Autor: Steffen Hannert Lizenz: PD
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  Seite 23: File:Parus_major_-_2013'03'30-15h34m02s-3426x2284.jpg Autor: Anatoly Vlasov Lizenz: CC BY-SA 3.0
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  Seite 23: File:Parus_major_-Scotland-8.jpg (https://www.flickr.com/photos/bird-tracker/6427086373/) Autor: Mark Medcalf Lizenz: CC BY 2.0
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  Seite 23: File:Parus_ater01.jpg Autor: Sławek Staszczuk Lizenz: CC BY-SA 3.0, GNU 1.2+
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  Seite 23: File:Coal_Tit_2a_(5164707800).jpg (https://www.flickr.com/photos/hisgett/5164707800/) Autor: Tony Hisgett from Birmingham, UK Lizenz: CC BY 2.0
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  Seite 24: File:ParusCaeruleus.jpg Autor: Maximilian Dorsch Lizenz: CC BY-SA 3.0
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  Seite 24: File:Lophophanes_cristatus_Luc_Viatour_4.jpg Autor: Luc Viatour (www.lucnix.be) Lizenz: CC BY-SA 3.0, GNU 1.2+
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  Seite 24: File:Parus_cristatus_czubatka_AM.jpg Autor: Artur Mikołajewski Lizenz: CC BY-SA 3.0, GNU 1.2+

for the pictures, see file

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