Hertfordshire Amphibian and Reptile Group (HertsARG)

About us

About Us

Hertfordshire Amphibian and Reptile Group (HertsARG) was established in 2011 to promote, conserve and study Hertfordshire's native populations of reptiles and amphibians. Since then we have gone from strength to strength and warmly welcome new members whatever their level of knowledge or experience. We have  Whatsapp and Facebook groups.  The group contains several licensed great crested newt workers and we are happy to take questions and queries from the public on these and other species.

The following species are found in Hertfordshire;

Smooth newts (Lissotriton vulgaris)

Great crested newts (Triturus cristatus)

Palmate newts (Lissotriton helvetica)

Common frogs (Rana temporaria)

Common toads (Bufo bufo)

Midwife toads (Alytes obstetricans) *Non-native and generally restricted to St Albans area*

Common/viviparous lizards (Zootoca vivpara)

Wall lizards (Podarcis muralis)

Slow worms (Anguis fragilis)

Grass snake (Natrix helvetica)

There are no reliable records of adders (Viper berus) in Hertfordshire. Despite extensive searching across the county, we have not found any. They are therefore regarded as extinct here, pending proof of any animals being provided.  Any suspected bites or injuries should be taken to hospital  or veterinary surgery. 

Over the coming months we hope there will be news of a number of interesting and valuable conservation and research projects. Should you wish to become involved, or simply to be kept updated of progress, please email your contact details to davewillisbhs@yahoo.co.uk.

If you have any questions or ideas for future work, or know of a site you think may be of interest, let us know!



David Willis - Founder

(Please email for details, upcoming projects and any unwanted animals)


Telephone: 07581121270

Mammal Amphibian and Reptile Atlas (MARA) and Herp record queries;

Dr Chantal Helm or Mr Ian Flack
University of Hertfordshire





Visit to Dorset wall lizard populations

Posted on Wednesday 23rd February, 2011
Dave Willis of Herts ARG visited Dorset in August 2010 to try his luck at spotting one of our most unusual reptile species, the European wall lizard (Podarcis muralis). Although it is not native to Britain, dozens of populations have become established in southern Britain over recent decades. Most of them are probably the result of animals being deliberately released. It is illegal to introduce alien species to the wild, and some conservationists fear that wall lizards may be a danger to native reptiles, especially as they seem to be doing so well. Populations are thriving and spreading in many places, particularly along the south coast of England.

Dorset is one of the ‘hotspots’ with around a dozen populations, and an easy target for a day of wall lizard spotting. Dave Willis was accompanied by Dave Bird when he visited a recently-reported population at the Medieval beauty spot of Corfe Castle. They only saw one animal there, but even this would not have been possible on an hoc visit if there weren’t plenty more of them. The second site was Poole Bay cliffs, where several population centres are spreading outwards along a seven-mile stretch of habitat. Hence the sightings on Dave’s trip last August were numerous.

Dave Willis said: “Although we only turned up one juvenile wall lizard at Corfe Castle, Poole cliffs were teeming with them!.”

HertsARG Structure and constitution

Posted on Wednesday 23rd February, 2011
  • HertsARG exists to promote the conservation, appreciation and study of Hertfordshire’s native herpetofauna through active conservation and research projects, the promotion of like-minded organisations and groups and other work.
  • HertsARG will enadeavour to work with all relevant local organisations in order to promote, protect and understand the reptiles and amphibians of Hertfordshire.
  • HertsARG will both initiate projects and assist other organisations whenever possible.
  • Membership will be open to all interested parties via application to the chair.
  • The organisation of HertsARG will be managed through a board elected from membership*, which will include; Chairman, Secretary, Treasurer (if needed), website officer and others as necessary. *When membership commences.
  • HertsARG intends to be able to work with all age-groups and social identities. All members must be prepared to submit to a CRB check in the event that a project requires it. Abusive, anti-social or discriminatory behaviour whilst engaged on a project, or which may effect the standing or work of the group may result in membership being terminated.
  • An Annual General Meeting will be held.



Show Past Events

Toad Crossings 2021

Mon 1st February, 2021 - Wed 31st March, 2021

Want to help out our declining toads? Several Toad crossing sites are now registered in Hertfordshire at a range of locations, and HertsARG volunteers have been helping out wherever they can. Please get in touch if you would like to help toads on roads, or know of a site where they are being killed by cars on the way to their ponds.

Contact us

Contact Us

David Willis - Founder

(Please email for details, upcoming projects and any unwanted animals)


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