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A complete List of introduced species for even quite small areas of the world would be dauntingly long. Humans have introduced more different species to new environments than any single document can hope to record. The following list of introduced species, in other words, is hopelessly incomplete.
Mammals
Ass aka Donkey from Africa
Cattle from Europe
Sheep from Asia
Cat from Africa/Europe
Norway Rat from Europe
Swine from Europe
Goat from Africa
Guinea Pig from South America
Horse from Europe
Nutria or coypu from South America
Nilgai from India
Hedgehogs from Europe via New Zealand
Sika deer from Asia
Various exotic animals kept as pets, e.g., chinchillas or dwarf hamsters
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Birds
Chukar from Europe
Eurasian Collared-Dove from Europe
Eurasian Tree Sparrow from Europe
European Starling from Europe
Gray Partridge from Europe
Himalayan Snowcock from Asia
House Sparrow from Europe
Monk Parakeet from South America
Muscovy Duck
Mute Swan from Europe
Ring-necked Pheasant from Asia and Europe
Rock Dove from Europe
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Reptiles
Brown Anole
Green Iguana
Wall lizard from Italy in the 1950s
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Fish
Round goby from Eurasia
Eurasian ruffe from Eurasia
Common carp from Europe
Cherry barb from Sri Lanka
Bighead carp from China
Silver carp from Asia
Sea lamprey, introduced into the Great Lakes through the Welland canal c.1921
Snakehead from China
Tubenose goby from Europe
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Crustaceans
European green crab from Atlantic coasts of Europe, northern Africa, from Norway to the British Isles south to Mauritania
Chinese mitten crab from the coastal rivers and estuaries of the Yellow Sea
Japanese shore crab from Japan
Spiny waterflea from northern Europe and western Russia
Fishhook waterflea from the #####-Caspian region
Mud shrimp from Europe
[edit]
Mollusks
Common periwinkle from Europe
Chinese mystery snail from Asia
Zebra mussel from the Caspian and Black Seas
Veined rapa whelk from the Sea of Japan
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Insects
Asian gypsy moth from Siberia
Asian long-horned beetle
Asian Tiger Mosquito
Balsam woolly adelgid
Beech scale
Birch leafminer
Brown spruce longhorn beetle from Europe
Cabbage White (=Small White) butterfly from Europe
European elm bark beetle
European pine sawfly
European pine shoot moth
European spruce sawfly
Formosan subterranean termite
Gypsy moth from Europe
Hemlock woolly adelgid from Japan
Larch casebearer
Larch sawfly
Pear thrip from Europe
Phroid Fly from South America
Red imported fire ant from South America
Varroa mite from Asia
Western honeybee from Europe
Winter moth
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Plants
Eurasian watermilfoil from Europe, Asia and northern Africa
Ice plant from South Africa
Eucalypts from Australia
Hesperis matronalis -- Dame's rocket from Eurasia
Vicia cracca -- Cow vetch from Eurasia
Vicia villosa -- Hairy vetch from Eurasia
Lonicera japonica -- Japanese honeysuckle
Lonicera maackii -- Amur honeysuckle
Rosa multiflora -- Multiflora rose
Lythrum salicaria -- Purple loosestrife
Pueraria montana -- Kudzu (aka Pueraria lobata)
Celastrus orbiculatus -- Oriental bittersweet
Elaeagnus umbellata -- Autumn olive
Alliaria petiolata -- Garlic mustard
Hydrilla verticillata -- Hydrilla from India and Sri Lanka
Trapa natans -- Water caltrop from Eurasia
Eichhornia crassipes -- Water hyacinth from South America
Pistia stratiotes -- Water lettuce from South America
Ipomoea aquatica -- Water spinach from India and southeast Asia
Arundo donax -- Giant reed from the Mediterranean
Conium maculatum -- Poison hemlock from Europe
Salvinia molesta -- Giant salvinia from Brazil
Hedera helix -- English ivy from Europe
Fucus serratus -- Rockweed from Europe
Codium fragile subsp. tomentosoides -- Green sea fingers
Centaurea Diffusa -- Diffuse knapweed