According to the BOU, the following species have established self-sustaining feral/introduced populations.
· Mute Swan Cygnus olor AC
· Greylag Goose Anser anser AC
· Canada Goose Branta canadensis AC
· Egyptian Goose Alopochen aegyptiaca C
· Mandarin Duck Aix galericulata C
· Gadwall Anas strepera AC
· Mallard Anas platyrhynchos AC
· Ruddy Duck Oxyura jamaicensis C
· Western Capercaillie Tetrao urogallus BC
· Red-legged Partridge Alectoris rufa C
· Grey Partridge Perdix perdix AC
· Common Pheasant Phasianus colchicus C
· Golden Pheasant Chrysolophus pictus C
· Lady Amherst's Pheasant Chrysolophus amherstiae C
· Red Kite Milvus milvus AC
· White-tailed Eagle* Haliaeetus albicilla AC
· Northern Goshawk Accipiter gentilis AC
· Rock Pigeon Columba livia AC
· Rose-ringed Parakeet Psittacula krameri C
· Little Owl Athene noctua C
While the following species have been recorded as nesting in the wild either ferally/as a result of introductions (no doubt there are some other species also)
· Black Swan Cygnus atratus (Australia, New Zealand) E*
· Whooper Swan Cygnus cygnus (N Europe, N Asia; winters C Europe, C Asia, China) AE*
· Swan Goose Anser cygnoides (NC Asia, Siberia; winters China) E*
· Pink-footed Goose Anser brachyrhynchus (Greenland, Iceland, Svalbard) AE*
· Greater White-fronted Goose Anser albifrons (Holarctic) AE*
· Lesser White-fronted Goose Anser erythropus (N Eurasia) AE*
· Bar-headed Goose Anser indicus (C Asia) E*
· Snow Goose Anser caerulescens (N America & Greenland) AE*
· Ross’s Goose Anser rossii (C Canada, winters S USA) E*
· Barnacle Goose Branta leucopsis (E Greenland, Svalbard, Novaya Zemlya) AE*
· Magellan/Upland Goose Chloephaga picta (S America) E*
· Ruddy Shelduck Tadorna ferruginea (N Africa, S Eurasia) BE*
· Muscovy Duck Cairina moschata (C & S America) E*
· Wood Duck Aix sponsa (N America) E*
· Wigeon Anas penelope (Eurasia) AE*
· Cinnamon Teal Anas cyanoptera (Americas) E*
· Red-crested Pochard Netta rufina (SW Eurasia) AE*
· Pochard Aythya ferina (Eurasia) AE*
· Northern Bobwhite Colinus virginianus (N & C America) E*
· Rock Partridge Alectoris graeca (SE Europe) E*
· Chukar Alectoris chukar (C & E Eurasia) E*
· Silver Pheasant Lophura nycthemera (SE Asia) E*
· Reeves’s Pheasant Syrmaticus reevesii (China) E*
· Purple Swamphen Porphyrio porphyrio (S Europe, Africa, Asia) E*
· Black-crowned Night Heron Nycticorax nycticorax (Eurasia, Africa, Americas) AE*
· Osprey Pandion haliaetus (cosmopolitan) AE*
· Common Buzzard Buteo buteo (Eurasia) AE*
· Budgerigar Melopsittacus undulatus (Australia) E*
· Alexandrine Parakeet Psittacula eupatria (India, SE Asia) E*
· Blue-crowned Parakeet Aratinga acuticaudata (S America) E*
· Monk Parakeet Myiopsitta monachus (S America) E*
· Barn Owl Tyto alba (cosmopolitan) AE*
· Eurasian Eagle Owl Bubo bubo (Palaearctic) E*
If you follow BOU 'rules', it is only permitted to 'tick' feral birds from the first list.
James