List of bird species at the Peter's birding page

Images here have the highest dimension of 1200 px, for most of the images I have also versions with the higher resolution, let me know if you need them.
All images linked here are (C) by Peter Ertl and released under the terms of the Creative Commons Attribution-NoDerivatives 4.0 International License

Alpendohle, Alpine Chough
Alpenkrähe, Red-billed Chough
Alpensegler, Alpine Swift
Alpenstrandläufer, Dunlin
Amsel, Common Blackbird
Andenente, Yellow-billed teal
Auerhuhn, Western Capercaillie
Austernfischer, Eurasian Oystercatcher
Bachstelze, White Wagtail
Bahamaente, White-cheeked pintail
Bartmeise, Bearded Reedling
Bartsittich, Red-breasted Parakeet
Baumfalke, Eurasian Hobby
Baumpieper, Tree Pipit
Bekassine, Common Snipe
Bergente, Greater Scaup
Bergfink, Brambling
Berglaubsänger, Western Bonelli's Warbler
Bergpieper, Water Pipit
Beutelmeise, Remiz pendulinus
Bienenfresser, European Bee-eater
Bläsgans, Greater White-fronted Goose
Blässhuhn, Eurasian Coot
Blassspötter, Eastern olivaceous warbler
Blaumeise, Blue Tit
Blaumerle, Blue Rock-thrush
Brandgans, Common Shelduck
Braunkehlchen, Whinchat
Brautente, Wood Duck
Bruchwasserläufer, Wood Sandpiper
Buchfink, Common Chaffinch
Buntspecht, Great Spotted Woodpecker
Chilepfeifente, Chiloe' wigeon
Distelfink, European Goldfinch
Dohle, Western Jackdaw
Dorngrasmücke, Common Whitethroat
Drosselrohrsänger, Great Reed Warbler
Dunkler Wasserläufer, Spotted Redshank
Eichelhäher, Eurasian Jay
Eiderente, Common Eider
Eisente, Long-tailed Duck
Eistaucher, Common Loon
Eisvogel, Common Kingfisher
Elster, Eurasian Magpie
Erlenzeisig, Eurasian Siskin
Fahlsegler, Pallide Swift
Fasan, Common Pheasant
Feldlerche, Eurasian Skylark
Feldsperling, Eurasian Tree Sparrow
Felsenkleiber, Western rock nuthatch
Felsenschwalbe, Eurasian Crag Martin
Felsensteinschmätzer, Finsch's wheatear
Fichtenkreuzschnabel, Red Crossbill
Fischadler, Osprey
Fitis, Willow Warbler
Flussregenpfeifer, Little Ringed Plover
Flussseeschwalbe, Common Tern
Flussuferläufer, Common Sandpiper
Gänsesäger, Common Merganser
Gartenbaumläufer, Short-toed Treecreeper
Gartengrasmücke, Garden Warbler
Gartenrotschwanz, Common Redstart
Gebirgsstelze, Grey Wagtail
Gimpel, Eurasian Bullfinch
Girlitz, European Serin
Gluckente, Baikal teal
Goldammer, Yellowhammer
Goldregenpfeifer, European Golden Plover
Grauammer, Corn Bunting
Graugans, Greylag Goose
Graukopfkasarka, South African Shelduck
Graureiher, Grey heron
Grauschnäpper, Spotted Flycatcher
Grauspecht, Grey-headed Woodpecker
Grosser Brachvogel, Eurasian Curlew
Grünfink, European Greenfinch
Grünschenkel, Common Greenshank
Grünspecht, European Green Woodpecker
Hänfling, Common Linnet
Halsbandsittich, Rose-ringed parakeet
Haubenlerche, Crested Lark
Haubenmeise, European Crested Tit
Haubentaucher, Great Crested Grebe
Hausrotschwanz, Black Redstart
Haussperling, House Sparrow
Heckenbraunelle, Dunnock
Heidelerche, Woodlark
Heiliger Ibis, Sacred Ibis
Heringsmöwe, Lesser Black-backed Gull
Höckerschwan, Mute Swan
Hohltaube, Stock Dove
Italiensperling, Italian Sparrow
Kampfläufer, Ruff
Kanadagans, Canada Goose
Kernbeisser, Hawfinch
Kiebitz, Northern Lapwing
Kiebitzregenpfeifer, Grey Plover
Klappergrasmücke, Lesser Whitethroat
Kleiber, Eurasian Nuthatch
Kleine Bergente, Lesser Scaup
Kleiner Gelbschenkel, Lesser Yellowlegs
Kleines Sumpfhuhn, Little Crake
Knäkente, Garganey
Kohlmeise, Great Tit
Kolbenente, Red-crested Pochard
Kolkrabe, Northern Raven
Kormoran, Great Cormorant
Kranich, Common Crane
Krickente, Eurasian Teal
Kuckuck, Common Cuckoo
Kuhreier, Western Cattle Egret
Lachmöwe, Common Black-headed Gull
Lachseeschwalbe, Gull-billed Tern
Löffelente, Northern Shoveler
Löffler, Eurasian Spoonbill
Mähnengans, Australian wood duck
Mäusebussard, Common Buzzard
Mandarinente, Mandarin Duck
Mantelmöwe, Great Black-backed Gull
Mauerläufer, Wallcreeper
Mauersegler, Common Swift
Mehlschwalbe, Common House Martin
Misteldrossel, Mistle Thrush
Mittelmeermöwe, Yellow-legged Gull
Mittelsäger, Red-breasted Merganser
Mittelspecht, Middle Spotted Woodpecker
Mönchsgrasmücke, Eurasian Blackcap
Moorente, Ferruginous Duck
Nachtigall, Common Nightingale
Nachtreiher, Black-crowned Night Heron
Nebelkrähe, Hooded Crow
Neuntöter, Red-backed Shrike
Nilgans, Egyptian Goose
Odinshünchen, Red-necked Phalarope
Ohrentaucher, Horned Grebe
Orpheusspötter, Melodious Warbler
Ortolan, Ortolan Bunting
Palmtaube, Laughing dove
Pfeifente, Eurasian Wigeon
Pfuhlschnepfe, Bar-tailed Godwit
Pirol, Eurasian Golden Oriole
Prachttaucher, Black-throated Loon
Präriemöwe, Franklin's gull
Purpurreiher, Purple Heron
Rabenkrähe, Carrion Crow
Rallenreiher, Squacco Heron
Raubseeschwalbe, Caspian Tern
Raubwürger, Great Grey Shrike
Rauchschwalbe, Barn Swallow
Reiherente, Tufted Duck
Ringeltaube, Common Wood Pigeon
Ringschnabelente, Ring-necked Duck
Rötelpelikan, Pink-backed Pelican
Rohrammer, Common Reed Bunting
Rohrdommel, Eurasian Bittern
Rohrschwirl, Savi's Warbler
Rohrweihe, Western Marsh Harrier
Rosenstar, Rosy Starling
Rostgans, Ruddy Shelduck
Rotdrossel, Redwing
Rothalsgans, Red-breasted Goose
Rothalstaucher, Red-necked Grebe
Rotkehlchen, European Robin
Rotkopfwürger, Woodchat Shrike
Rotmilan, Red Kite
Rotschenkel, Common Redshank
Rotschulterente, Ringed teal
Saatkrähe, Rook
Säbelschnäbler, Pied Avocet
Samtente, Velvet Scoter
Samtkopfgrasmücke, Sardinian Warbler
Sandregenpfeifer, Common Ringed Plover
Schafstelze, Western Yellow Wagtail
Schellente, Common Goldeneye
Schlangenadler, Short-toed Snake-eagle
Schleiereule, Common Barn-owl
Schnatterente, Gadwall
Schneesperling, White-winged Snowfinch
Schwanengans, Swan goose
Schwanzmeise, Long-tailed Bushtit
Schwarzhalstaucher, Black-necked Grebe
Schwarzkehlchen, Eurasian Stonechat
Schwarzkopfmöwe, Mediterranean Gull
Schwarzkopfruderente, Ruddy Duck
Schwarzmilan, Black Kite
Schwarzschwan, Black Swan
Schwarzspecht, Black Woodpecker
Schwarzstirnwürger, Lesser grey shrike
Schwarzstorch, Black stork
Seidenreiher, Little Egret
Seidenschwanz, Bohemian Waxwing
Sichelente, Falcated Duck
Sichelstrandläufer, Curlew Sandpiper
Sichler, Glossy Ibis
Silberreiher, Great Egret
Singdrossel, Song Thrush
Singschwan, Whooper Swan
Sommergoldhänchen, Firecrest
Sperber, Eurasian Sparrowhawk
Spiessente, Northern Pintail
Spitzschwanzente, Yellow-billed pintail
Star, Common Starling
Steinadler, Golden Eagle
Steinschmätzer, Northern Wheatear
Steinwälzer, Ruddy Turnstone
Stelzenläufer, Black-winged Stilt
Steppenmöwe, Caspian Gull
Sterntaucher, Red-throated Loon
Stockente, Mallard
Strassentaube, Feral Pigeon
Streifengans, Bar-headed Goose
Sturmmöwe, Common Gull
Sumpfmeise, Marsh Tit
Sumpfrohrsänger, Marsh Warbler
Tafelente, Common Pochard
Tannenhäher, Spotted Nutcracker
Tannenmeise, Coal Tit
Teichhuhn, Common Moorhen
Teichrohrsänger, Eurasian Reed Warbler
Trauerente, Common Scoter
Trauerschnäpper, European Pied Flycatcher
Trauerseeschwalbe, Black Tern
Triel, Eurasian Stone-curlew
Tüpfelsumpfhuhn, Spotted Crake
Türkentaube, Eurasian Collared Dove
Tundrasaatgans, Bean goose
Turmfalke, Common Kestrel
Turteltaube, European Turtle Dove
Uferschnepfe, Black-tailed Godwit
Uferschwalbe, Sand Martin
Uhu, Eurasian Eagle-Owl
Wacholderdrossel, Fieldfare
Waldkauz, Tawny Owl
Waldlaubsänger, Wood Warbler
Waldohreule, Northern Long-eared Owl
Waldrapp, Northern bald ibis
Waldwasserläufer, Green Sandpiper
Wanderfalke, Peregrine Falcon
Warzenente, Domestic Muscovy Duck
Wasseramsel, White-throated Dipper
Wasserralle, Water Rail
Weissbartseeschwalbe, Whiskered Tern
Weissstorch, White Stork
Weisswangengans, Barnacle Goose
Wendehals, Eurasian Wryneck
Wespenbussard, European Honey Buzzard
Wiedehopf, Eurasian Hoopoe
Wiesenpieper, Meadow Pipit
Wintergoldhänchen, Goldcrest
Zaunammer, Cirl Bunting
Zaunkönig, Winter Wren
Zilpzalp, Common Chiffchaff
Zitronenzeisig, Citril Finch
Zwergdommel, Little Bittern
Zwerggans, Lesser White-fronted Goose
Zwergkanadagans, Cackling goose
Zwergmöwe, Little Gull
Zwergsäger, Smew
Zwergscharbe, Pygmy Cormorant
Zwergschnepfe, Jack Snipe
Zwergstrandläufer, Little Stint
Zwergtaucher, Little Grebe