Slow Worm
Slow WormSlow WormSlow WormSlow Worm

Slow Worm

Anguis fragilis

Least ConcernNear ThreatenedVulnerableEndangeredCritically Endangered
10–20% · With luck
overall probability at Biebrza National Park
8 Verified records at Biebrza National Park
April Best month highest sighting rate
☀️ Diurnal When it's active during daytime hours (6am–6pm)

The common slow worm (Anguis fragilis) is a non-venomous species of legless lizard native to Europe. It is also called a deaf adder, blindworm, or regionally, a long-cripple, steelworm, and hazelworm. Despite confusion, the common slow worm is not a worm, or a snake. Common slow worms are semifossorial (burrowing) lizards that spend much of their time hiding underneath objects. The skin of slow worms is smooth, with scales that do not overlap. Wikipedia →

10–20% of wildlife watchers report a Slow Worm sighting in Biebrza National Park, based on 8 days of visitor records from GBIF citizen-science data.

Closest Relatives at Biebrza National Park

Eastern Slow-worm

Eastern Slow-worm

☀️ Diurnal Reptile

Anguis colchica

10–20% · With luck

📅 Monthly Probability

5–10
Jan
5–10
Feb
<5
Mar
20–30
Apr
20–30
May
10–20
Jun
20–30
Jul
<5
Aug
<5
Sep
5–10
Oct
5–10
Nov
10–20
Dec

☀️ When They're Spotted

Most active during daytime hours (6am–6pm) · across all parks (global)

☀️Diurnal
☀️🌙🌙12am6am12pm6pm12am

Global Distribution

Where this species is recorded worldwide. Restricted to human observations from 2019 onwards — the same kind of record and the same period the probabilities on this page are built from, so collar-tracking studies, camera-trap arrays and museum specimens are excluded. Around Santa Rosa that removes 5,924 GPS fixes from a handful of tagged jaguars.

where this species is recorded (GBIF density — it tracks where observers go, not how likely a sighting is)  ·  parks where it occurs — tap a pin for the sighting probability there

Parks Where Found

# Park Country Probability
1 Snowdonia National Park 🇬🇧 United Kingdom
40–50%
2 Triglav National Park 🇸🇮 Slovenia
40–50%
3 Bavarian Forest National Park 🇩🇪 Germany
40–50%
4 Cévennes National Park 🇫🇷 France
30–40%
5 Picos de Europa National Park 🇪🇸 Spain
30–40%
6 Pyrénées National Park 🇫🇷 France
20–30%
7 Cairngorms National Park 🇬🇧 United Kingdom
20–30%
8 Biebrza National Park 🇵🇱 Poland
10–20%
9 Aigüestortes National Park 🇪🇸 Spain
10–20%
10 Fertő-Hanság National Park 🇭🇺 Hungary
10–20%
11 Wadden Sea National Park 🇩🇪 Germany
10–20%
12 Ordesa y Monte Perdido National Park 🇪🇸 Spain
Insufficient data
13 Tatra National Park 🇸🇰 Slovakia
Insufficient data

Quick answers

What are the chances of seeing a Slow Worm in Biebrza National Park?

About 19% of wildlife watchers report a Slow Worm sighting in Biebrza National Park, based on 8 days of visitor records from GBIF citizen-science data.

When is the best time to see Slow Worm in Biebrza National Park?

April has the highest sighting rate for Slow Worm in Biebrza National Park in our monthly data.

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