While some sites class any species which wasn't found in Britain when it was cut off from Europe, here we class any which were introduced by human help, and not those which made it here naturally. A category for all species that are not native to Britain, but are living in the countryside as a result of introduction. The Grey Squirrel is a famous example.
Some species have had a major impact on other wildlife (such as the American Mink and Himalayan Balsam), some have little apparent impact, but still do impact native wildlife (such as the Light Brown Apple Moth), and others have become so established in Britain, many don't realise they are aliens. (such as the Rabbit).
Species such as the Fallow Deer have been in Britain for hundreds of years, but others have only recently been introduced to Britain (such as the Western Green Lizard and Western Conifir Seed Bug).
All items (312)
- Aesculapian Snake
- File:Aesculapian snake London small.jpg
- African Clawed Frog
- File:African clawed frog.png
- African Grey Parrot
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- File:Albino Goldfish.jpg
- File:Albinogreysquirrel.jpg
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- Alpine Newt
- File:Alpine Newt.jpg
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- American Bull Frog
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- American Mink
- American Skunk-cabbage
- File:American Skunk-cabbage.JPG
- Amur Ratsnake
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- File:Animals 036.JPG
- File:Animals 067.JPG
- File:Animals 073.JPG
- File:Animals 091.JPG
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- File:Argyresthia cupressella - Cypress Tip Moth.JPG
- Argyresthia trifasciata
- File:Argyresthia trifasciata 1.jpg
- File:Argyresthia Trifasciata ~ Ian Kimber.jpg
- File:Argyresthia trifasciata.JPG
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- Australian Cockroach
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- Azalea Leaf Miner
- Balsam Carpet
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- File:Birds.2010 006.jpg
- File:Birds.2010 183.jpg
- File:Birds.2010 606.jpg
- File:Birds.2010 611.jpg
- File:Birds.2011 1278.jpg
- Black Rat
- File:Black Rat.JPG
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- Black Swan
- File:Black Swan.jpg
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- Blair's Shoulder-knot
- File:BlairsShoulderKnotLarva ~ Ian Kimber.jpg
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- Brown Rat
- File:Brown Rat.jpg
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- File:Cameraria ohridella - Horse Chestnut Leaf-miner.JPG
- File:Cameraria ohridella - Horse-chestnut Leaf-miner (mine).JPG
- Canada Goose
- File:Canada Goose.jpg
- File:Canadagoosefeet.JPG
- Canadian Goldenrod
- File:Canadian Goldenrod.JPG
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- File:Chestnuts.jpg
- File:Chestnuts2.JPG
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- Chinese Water Deer
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- Common Garter Snake
- Common Mallow
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- Corsican Pine
- Cream-streaked Ladybird
- File:Crepidula fornicata ~ Slipper Limpet.JPG
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- Cypress Carpet
- File:Cypress carpet underside (800x535).jpg
- File:Cypress carpet.JPG
- Cypress Pug
- File:Cypress Pug (800x532).jpg
- Cypress Tip Moth
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- Edible Dormouse
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- Egyptian Goose
- Elm Spanworm
- File:Elminius modestus ~ Darwin's Barnicle.JPG
- File:Ennomos subsignaria.jpg
- File:Eupithecia phoeniceata ~ Cypress Pug.JPG
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- European Rabbit
- European Silver Fir
- European Stick-insect
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- Giant Leopard Moth
- Golden Pheasant
- File:Golden Pheasant (S.Allen).jpg
- Goldfish
- File:Goldfish lake 2.jpg
- File:Goldfish lake.jpg
- File:Goldfish.jpg
- File:GoldfishZac.jpg
- Gooseberry
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- Greater Burdock
- Greater Quaking Grass
- File:Green Lizard.png
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- Grey Squirrel
- File:Grey Squirrel(2).jpg
- File:Grey Squirrel.jpg
- File:Grey squirrel.jpg