barred grass snake

barred grass snake

Natrix helvetica

Silhouette: Danny S. · PhyloPic

Least ConcernNear ThreatenedVulnerableEndangeredCritically Endangered
Daily sighting probability ~30% · Possible
at Snowdonia National Park
61 Verified sightings at Snowdonia National Park From 2019 to 2026
217 Verified sightings across all 9 parks From 2019 to 2026
May Best month highest sighting rate
☀️ Diurnal When it's spotted during daytime hours (6am–6pm)

About the barred grass snake

The barred grass snake (Natrix helvetica) is a non-venomous colubrid snake from Western Europe, typically living in and close to water. It was included within the grass snake species, Natrix natrix, until August 2017, when genetic analysis led to its reclassification as a separate species.

There are currently five subspecies of Natrix helvetica recognized (having been formerly classified as subspecies of N. natrix): N. helvetica helvetica (syn. N. natrix helvetica) – most of range N. helvetica cetti (syn. N. natrix cetti) – Sardinia

N. helvetica corsa (syn. N. natrix corsa) – Corsica N. helvetica lanzai (syn. N. natrix lanzai) – mainland Italy, but not south N. helvetica sicula (syn. N. natrix sicula) – Calabria and Sicily The barred grass snake has a dark grey-green upper body with distinctive black markings in the form of bars running along its sides. Its underside is pale. Like the grass snake, it has a distinctive yellow and black collar around its neck. It can grow to over a metre in length.

The species is found in Great Britain as far north as southern Scotland, and in the Netherlands, western Germany, Switzerland, Italy... Wikipedia →

Global Distribution

Warmer areas are where this animal is recorded most often.

Parks Where Found

# Park Country Daily sighting probability
1 Snowdonia National Park 🇬🇧 United Kingdom
~30%
2 Cévennes National Park 🇫🇷 France
~20%
3 Mercantour National Park 🇫🇷 France
~20%
4 Pyrénées National Park 🇫🇷 France
~10%
5 Wadden Sea National Park 🇩🇪 Germany
<5%
6 Aigüestortes National Park 🇪🇸 Spain
Insufficient data
7 Vanoise National Park 🇫🇷 France
Insufficient data
8 Ecrins National Park 🇫🇷 France
Insufficient data
9 Camargue 🇫🇷 France
Insufficient data

Quick answers

What are the chances of seeing a barred grass snake in Snowdonia National Park?

About 30% of wildlife watchers report a barred grass snake sighting in Snowdonia National Park, based on 61 verified sightings from GBIF citizen-science data.

When is the best time to see barred grass snake in Snowdonia National Park?

May has the highest sighting rate for barred grass snake in Snowdonia National Park in our monthly data.

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