Identification of invasive non-native species is an essential part of invasive species management. 

ID sheets have been developed to provide identification assistance. They can be accessed from the list below or by selecting the list by scientific name in the left hand side menu. These can also be freely downloaded, printed, used for stakeholder engagement and linked to from external websites. 
View this list ordered by scientific name 

• African Clawed-toad (Xenopus laevis) (PDF)
• Alpine Newt (Mesotriton alpestris) (PDF)
• American Mink (Mustela vison) (PDF)
• American Lobster (Homarus americanus) (PDF)
• American Skunk-cabbage (Lysichiton americanus)
• Asian Hornet (Vespa velutina) (PDF)
  
• Asian Shore Crab (Hemigrapsus sanguineus) (PDF)
• Australian Flatworm (Australoplana sanguinea) (PDF)
• Bar-headed Goose (Anser indicus) (PDF)
• Black Swan (Cygnus atratus) (PDF)
• Brush Clawed Crab (Hemigrapsus takanoi) (PDF)
• Bull Frog (Lithobates catesbeianus) (PDF)
• Canada Goose (Branta canadensis) (PDF)
• Canadian Goldenrod (Solidago canadensis) (PDF)
• Canadian Waterweed (Elodea canadensis) (PDF)
• Carolina Watershield (Cabomba caroliniana) (PDF)
• Carpet Sea Squirt (Didemnum vexillum) (PDF)
• Chinese Mitten Crab (Eriocheir sinensis) (PDF)
• Chinese Water Deer (Hydropotes inermis) (PDF)
• Coatimundi (Nasua nasua) (PDF)
• Cotoneaster (Cotoneaster species) (PDF)
• Curly Waterweed (Lagarosiphon major) (PDF)
• Edible Dormouse (Glis glis) (PDF)
• Egyptian Goose (Alopochen aegyptiacus) (PDF)
• Emperor Goose (Chen canagicus) (PDF)
• Eurasian Eagle Owl (Bubo bubo) (PDF)
• Evergreen Oak (Quercus ilex) (PDF)
• False Acacia (Robinia pseudoacacia) (PDF)
• Floating Pennywort (Hydrocotyle ranunculoides) (PDF)
• Garlics (Allium species) (PDF)
• Giant Hogweed (Heracleum mantegazzianum) (PDF)
• Giant Rhubarbs (Gunnera species) (PDF)
• Giant Salvinia (Salvinia molesta) (PDF)
• Himalayan Balsam (Impatiens glandulifera) (PDF)
• Hottentot Fig (Carpobrotus edulis) (PDF)
• Indian House Crow (Corvus splendens) (PDF)
• Japanese Knotweed (Fallopia japonica) (PDF)   Welsh language version (PDF) produced by Welsh Government and Snowdonia National Park
• Japanese Rose (Rosa rugosa) (PDF)
• Killer Shrimp (Dikerogammarus villosus) (PDF)
• Kontikia Flatworms (Kontikia ventrolineata and andersoni) (PDF)
• Leathery Sea Squirt (Styela clava) (PDF)
• Marsh Frog (Pelophylax ridibundus) (PDF)
• Midwife Toad (Alytes obstetricans) (PDF)
• Monk Parakeet (Myiopsitta monachus) (PDF)
• Montbretia (Crocosmia x crocosmiiflora) (PDF)
• Muntjac Deer (Muntiacus reevesi) (PDF)
• New Zealand Flatworm (Arthurdendyus triangulates) (PDF)
• New Zealand Pigmyweed (Crassula helmsii) (PDF)
• Nuttall's Waterweed (Elodea nuttallii) (PDF)
• Orange Sheath Tunicate (Botrylloides violaceus) (PDF)
• Parrot's Feather (Myriophyllum aquaticum) (PDF)
• Red-eared Terrapin (Trachemys scripta elegans) (PDF)
• Rhododendron (Rhododendron ponticum) (PDF)
• Rose-ringed Parakeet (Psittacula krameri) (PDF)
• Ruddy Duck (Oxyura jamaicensis) (PDF)
• Russian-vine (Fallopia baldschuanica) (PDF)
• Sacred Ibis (Threskiornis aethiopicus) (PDF)
• Siberian Chipmunk (Tamias sibiricus) (PDF)
• Signal Crayfish (Pacifastacus leniusculus) (PDF)
• Sika Deer (Cervus nippon) (PDF)
• Slipper Limpet (Crepidula fornicata) (PDF)
• Turkey Oak (Quercus cerris) (PDF)
• Wakame (Undaria pinnatifida) (PDF)
• Water Fern (Azolla filiculoides) (PDF)
• Water Lettuce (Pistia stratiotes) (PDF)
• Water Primrose (Ludwigia grandiflora) (PDF)
• Western Green Lizard (Lacerta bilineata) (PDF)
• Wireweed (Sargassum muticum) (PDF)
• Wood Duck (Aix sponsa) (PDF)
• Zebra Mussel (Dreissena polymorpha) (PDF)

We encourage you to comment on the ID sheets.  Please contact us.

• Freshwater Biological Association guidance on the idenfication of invasive shrimps and gastropods (external link)
• The Marine Pathways Group have produced a Marine identification guide (PDF) 
• The Environment Agency have produced fact sheets for a range of freshwater non-native fish (external link).
• Anglia Ruskin University have produced a crayfish information booklet (PDF).
• The Amphibian and Reptile Conservation Trust have produced an illustrated guide to non-native amphibian and reptile species in the UK (external link)
• Field guide to invasive plants and animals in Britain (external link) (2015), Bloomsbury