British Isles Exotic and Introduced Amphibians and Reptiles
Green Lizard - Lacerta viridis
Although native to the Channel islands, this species has been introduced to the mainland its only self supporting colony is in Bournmouth.
Wall Lizard - Podarcis muralis
This species is also native to the channel islands, but its presence on the mainland is much more widespread. Colonies exist in Ventnor, Bournmouth, Shoreham on Sea, Ludlow and Haywards Heath.
Portland and Purbeck have several colonies each.
There is and italian subspecies which is green backed found in Ventnor and Bournmouth, the nominate form which is brown backed are found on Portland.
Aesculapian Snake - Elaphe longissima
Present only in an around the grounds of the Welsh mountain zoo, Colwyn Bay, from where it escaped. This as the story goes happened in the 1960's where one gravid female escaped and the population has all come from this one source. The population is well over 100 individuals and they are found upto 0.5 miles from the zoo. Another smaller population is established at London zoo.
Marsh Frog - Pelophylax ridibundus
Escaped from garden in Kent and colonised Romney Marsh, it has spread north and west into Sussex, London, Essex and Norfolk. From a few individuals in the 1930's it now has a considerable population.
Edible Frog - Pelophylax kl. esculentus
This frog was first introduced to the UK in the 1830's and at various times since. It is present in Surrey, Essex and Middlesex and is slowly spreading but is very much an aquatic species.
Iberian Water Frog - Rana iberica
This frog was discovered a couple of years ago at Ham Wall RSPB where it is very widespread, it is also thouh to be present at Elmley RSPB.
North American Bullfrog - Lithobates cafesbeianus
Originally imported as pets, releases led to breeding in the Kent / Sussex border region, this colony has been removed and the few others that exist are being controlled.
This species is a menace and needs to be reported to the local Amphibian and reptile group.
African Clawed Toad - Xenopus laevis
Used in research, escaped and deliberate releases led to several colonies notably in the Isle of Wight and South Wales, where the only occasional sightings are reported.
Alpine Newt - Triturus alpestris
Deliberatly released it has formed small but stable colonies in several parts of the country notably Shropshire and Surrey.
Italian Crested Newt - Triturus carnifex
Again deliberatly released into several areas colonies in Surrey and Birmingham persist.
Marbled newt - Triturus marmoratus
Deliberatly released it has formed very small colonies in several parts of the country
Southern Midwife Toad - Alytes dickhilleni
The Midwife Toad was introduced into Northants in the early 1900's, it has persisted but not spread any distance. This species is native to Spain.
Midwife Toad - Alytes obstetricans
The Midwife Toad was originally introduced into Bedfordshire in the early 1900's, it has persisted and spread. Other populations also exist in other parts of the country, notably Northamptonshire, Yorkshire and Devon.
European Pond Terrapin - Emys orbicularis
Released pets have formed this population, it is not certain if they are breeding but numbers are stable possibly due to continued introductions and longevity of individuals. They can be found in the south of England mainly in slow flowing rivers.
The Norfolk broads apparently holds a small population but this cannot be confirmed.
Red Eared Terrapin - Trachemys scripta elegans
Released pets have formed this population, it is not certain if they are breeding but recent finds of eggs combined with the recent warmer climate make this a matter only of time. Current numbers are stable possibly due to continued introductions and longevity of individuals.
They can be found in the south of England particularly in parks and gardens.
European Tree Frog - Hyla arborea
Small populations existed in Dorset and the Isle of Wight, two larger populations persisted until recently in London and the New Forest. A small population still survives in Essex.
Yellow Bellied Toad - Bombina variegata
Several small populations have existed and may still do in London and Devon.
Released pets of many species exist in the UK, it is not certain if they are breeding but are able to live quite happily in our climate. Typical species include Map turtles, spanish terrapin, painted terrapin, Yellow Bellied Slider, Florida red bellied turtle and many more.