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225 species found for “opportunistic” in Europe
Tundra Swan
Cygnus columbianus
Greater Scaup
Aythya marila
Chukar
Alectoris chukar
Ruddy Turnstone
Arenaria interpres
Ivory Gull
Pagophila eburnea
Sabine's Gull
Xema sabini
Black-headed Gull
Chroicocephalus ridibundus
Little Gull
Hydrocoloeus minutus
Mew Gull
Larus canus
Herring Gull
Larus argentatus
Iceland Gull
Larus glaucoides
Lesser Black-backed Gull
Larus fuscus
Glaucous Gull
Larus hyperboreus
Great Black-backed Gull
Larus marinus
Gull-billed Tern
Gelochelidon nilotica
Black Tern
Chlidonias niger
Northern Fulmar
Fulmarus glacialis
Cory's Shearwater
Calonectris diomedea
Manx Shearwater
Puffinus puffinus
Great Shearwater
Ardenna gravis
Cattle Egret
Bubulcus ibis
Golden Eagle
Aquila chrysaetos
Northern Goshawk
Accipiter gentilis
Snowy Owl
Bubo scandiacus
Long-eared Owl
Asio otus
Merlin
Falco columbarius
Monk Parakeet
Myiopsitta monachus
European Starling
Sturnus vulgaris
Bohemian Waxwing
Bombycilla garrulus
Eurasian Tree Sparrow
Passer montanus
Common Redpoll
Acanthis flammea
White-winged Crossbill
Loxia leucoptera
Greater Spotted Eagle
Aquila clanga
Imperial Eagle
Aquila heliaca
Lesser Spotted Eagle
Aquila pomarina
Fucosa Eagle
Aquila fucosa
Aquila Pennatoides
Aquila pennatoides
Common Buzzard
Buteo buteo
Buteo conterminus
Buteo conterminus
Long-legged Buzzard
Buteo rufinus
Buteo spassovi
Buteo spassovi
Pallid Harrier x Montagu's Harrier
Circus macrourus x pygargus
Pallid Harrier
Falco macrourus
Bearded Vulture
Gypaetus barbatus
Gyps melitensis
Gyps melitensis
White-tailed Eagle
Haliaeetus albicilla
Haliaeetus nisus
Haliaeetus nisus
Black Kite
Milvus migrans
Red Kite
Milvus milvus
Red Kite x Black Kite
Milvus milvus x migrans
Egyptian Vulture
Neophron percnopterus
Palaeastur atavus
Palaeastur atavus
Gervais's Eagle
Aquila gervaisi
Promilio epileus
Promilio epileus
Egyptian Goose
Alopochen aegyptiaca
Risgo Duck
Anas risgoviensis
Rustic Duck
Anas rustica
Greater White-fronted Goose x Lesser White-fronted Goose
Anser albifrons x erythropus
Barnacle x Canada Goose (hybrid)
Branta leucopsis x canadensis
Sicilian Dwarf Swan
Cygnus equitum
Matanas enrighti
Matanas enrighti
Anas natator
Anas natator
Anser anatoides
Anser anatoides
Presbychen Abavus
Presbychen abavus
Lambrechts's Duck
Archeoquerquedula lambrechti
Common Eider x King Eider
Somateria mollissima x spectabilis
Eurotrochilus inexpectatus
Eurotrochilus inexpectatus
Kentish Plover
Charadrius alexandrinus
Eurasian Dotterel
Charadrius morinellus
Spur-winged Lapwing
Vanellus spinosus
Chroicocephalus cucullatus
Chroicocephalus cucullatus
Pallas's Gull
Ichthyaetus ichthyaetus
Mediterranean Gull
Ichthyaetus melanocephalus
Arctic Gull
Larus arcticus
Herring x Glaucous Gull Hybrid
Larus argentatus x hyperboreus
Herring x Great Black-backed Gull Hybrid
Larus argentatus x marinus
European Herring Gull
Larus argenteus
Armenian Gull
Larus armenicus
Caspian Gull
Larus cachinnans
Caspian Gull x European Herring Gull
Larus cachinnans x argentatus
Caspian Gull x Yellow-legged Gull
Larus cachinnans x michahellis
Dolnican Gull
Larus dolnicensis
Kelp Gull
Larus dominicanus
Elmore's Gull
Larus elmorei
Yellow-legged Gull
Larus flavipes
Lesser Black-backed x Herring Gull
Larus fuscus x argentatus
Great Black-headed Gull
Larus icthyaetus
Lake Gull
Larus lacus
Iceland Gull
Larus leucopterus
Lesser Black-backed Gull
Larus medius
Yellow-legged Gull
Larus michahellis
Snowy Gull
Larus niveus
Perpetual Gull
Larus perpetuus
Pristine Gull
Larus pristinus
Raemdonck's Gull
Larus raemdonckii
Northern Gull
Larus septentrionalis
Speculative Gull
Larus spec
Larus brachytarsus
Larus brachytarsus
Totanus teruelensis
Totanus teruelensis
Philomachus binagadensis
Philomachus binagadensis
Elorius paludicola
Elorius paludicola
Azov Snipe
Gallinago azovica
Tringa gracilis
Tringa gracilis
Totanus grivensis
Totanus grivensis
Wood Sandpiper
Tringa glareola
Tringa ocrophus
Tringa ocrophus
South Polar Skua
Stercorarius maccormicki
Parasitic Jaeger
Stercorarius parasiticus
Pomarine Jaeger
Stercorarius pomarinus
Stercorarius shufeldti
Stercorarius shufeldti
Great Skua
Stercorarius skua
Hantonian Agnopterus
Agnopterus hantoniensis
White Stork
Ciconia ciconia
Black Stork
Ciconia nigra
Leptoptilos pliocenicus
Leptoptilos pliocenicus
Pledge's Pale Flamingo
Palaelodus pledgei
Bolle's Pigeon
Columba bollii
Falco pisanus
Falco pisanus
Parnasiensis Pigeon
Eimeria parnasiensis
Larus Toliapicus
Larus toliapicus
Messelirrisor grandis
Messelirrisor grandis
Great Spotted Cuckoo
Clamator glandarius
Falco albidus
Falco albidus
Lanner Falcon
Falco biarmicus
Peregrine Falcon
Falco canadensis
Sooty Falcon
Falco concolor
Falco parasitus
Falco parasitus
Falco regulus
Falco regulus
Eurasian Kestrel
Falco tinnunculus
Paraortygoides messelensis
Paraortygoides messelensis
Lady Amherst's Pheasant
Chrysolophus amherstiae
Golden Pheasant
Chrysolophus pictus
Canary Islands Quail
Coturnix gomerae
Palaeoperdix keltica
Palaeoperdix keltica
Lagopus atavus
Lagopus atavus
Perdix novae
Perdix novae
Pliogallus coturnoides
Pliogallus coturnoides
Deperet's Palaeocryptonyx
Palaeocryptonyx depereti
Geranopsis hastingsiae
Geranopsis hastingsiae
Siberian Crane
Grus leucogeranus
Probalearica moldavica
Probalearica moldavica
Red-knobbed Coot
Fulica cristata
Eurasian Moorhen
Gallinula chloropus
Houbara Bustard
Chlamydotis undulata
Olive-tree Warbler
Hippolais olivetorum
Booted Warbler
Iduna caligata
Western Jackdaw
Coloeus monedula
Corvus antecorax
Corvus antecorax
Carrion Crow
Corvus corone
Rook
Corvus frugilegus
Hungarian Crow
Corvus hungaricus
Corvus littoralis
Corvus littoralis
Pliocene Crow
Corvus pliocaenus
Praecorax Crow
Corvus praecorax
Corvus spec
Corvus spec
Eurasian Jay
Garrulus glandarius
Eurasian Nutcracker
Nucifraga caryocatactes
Nucifraga platyrhynchos
Nucifraga platyrhynchos
Eurasian Magpie
Pica pica
Yellow-billed Chough
Pyrrhocorax graculus
Pyrrhocorax primigenius
Pyrrhocorax primigenius
Common Waxbill
Estrilda astrild
Trumpeter Finch
Bucanetes githagineus
Coccothraustes simeonovi
Coccothraustes simeonovi
Fringilla butyracea
Fringilla butyracea
Azores Chaffinch
Fringilla moreletti
Loxia quinticolor
Loxia quinticolor
Loxia tridactyla
Loxia tridactyla
Loxia variegata
Loxia variegata
Asturian Shrike
Lanius asturinus
Steppe Grey Shrike
Lanius pallidirostris
Lanius phoenicurus
Lanius phoenicurus
Common Grasshopper-Warbler
Locustella naevia
Anthus spipoletta
Anthus spipoletta
Citrine Wagtail
Motacilla citrina
Taiga Flycatcher
Ficedula albicilla
Finsch's Wheatear
Oenanthe finschii
Rufous-backed Redstart
Phoenicurus erythronotus
Azure Tit x Blue Tit
Cyanistes cyanus x caeruleus
Willow Tit
Poecile montanus
Pale Rockfinch
Carpospiza brachydactyla
Spanish Sparrow
Passer hispaniolensis
Italian Sparrow
Passer italiae
Eurasian Tree Sparrow x House Sparrow
Passer montanus x domesticus
Pyrgita brachyrhynchos
Pyrgita brachyrhynchos
Canary Islands Chiffchaff
Phylloscopus canariensis
Alpine Accentor
Prunella collaris
White-spectacled Bulbul
Pycnonotus xanthopygos
Sitta senogalliensis
Sitta senogalliensis
Nabirop Starling
Sturnus nabirop
Subalpine Warbler
Sylvia cantillans
Tristram's Warbler
Sylvia deserticola
Ardea aequinoctialis
Ardea aequinoctialis
Hybrid Heron
Ardea cinerea x alba
Western Reef Heron
Ardea paloccidentalis
Purple Heron
Ardea purpurea
Herodias timoriensis
Herodias timoriensis
Proardea deschutteri
Proardea deschutteri
Emu-like Lithornis
Lithornis emuinus
Wetmore's Bony-toothed Bird
Tympanonesiotes wetmorei
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