Some 12000 species in the environment of the Union and in other European countries are alien, of which roughly 10 to 15 % are estimated to be invasive.
Tá thart ar 12000 speiceas sa timpeallacht san Aontas agus i dtíortha eile na hEorpa ar speicis iad atá coimhthíoch, agus meastar thart ar 10 go 15 % acu a bheith ionrach.