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Anguis fragilis
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Subclass: Lepidosauria
Order: Squamata
Suborder: Lacertilia
Family: Anguidae
Subfamily: Anguinae
Genus: Anguis
Linnaeus, 1758[1]

A. cephallonica
A. fragilis

Anguis, or the slow worm, is a small genus of lizards in the family Anguidae. It has two described species.


Slow worms are typically grey-brown, with the females having a coppery sheen and two lateral black stripes, and the males displaying electric blue spots, particularly in the breeding season. They give birth to live young; the young are about 4 cm (1.6 in) long at birth and generally have golden stripes.

As their name indicates, slow worms are slow moving and can be easily caught. Like many lizards, slow worms can shed their tails to distract predators. The tail regrows, but never fully.[2] Principal predators are birds, badgers, hedgehogs, foxes and domestic cats.[3][4][5]

Slow worms may grow up to 30 cm long and 100g in weight, and may live for 20 or 30 years in the wild.[4][5]


Although they are lizards, slow worms have lost their limbs completely and are often mistaken for snakes. Slow worms typically grow to between 40 and 50 cm (16 and 20 in), with the females slightly larger than the males. The tail makes up around half of its length, but is indistinguishable from the body.

Slow worms can be distinguished from snakes by several features: their eyelids, which snakes lack entirely; their small ear openings which again snakes lack; and their tongues, which are notched in the centre rather than completely forked like a snake's.


Slow worms live in any habitat that is warm and protected such as woodland, grassland and heathland; they are frequently found in garden compost heaps.[5] They range across most of Europe, and into parts of Asia, but they are restricted to temperate and humid habitats. They hibernate from October to February/March, both communally and solitarily, and sometimes share hibernating sites with other reptiles.


Slow worms have grooved teeth which allow them to grab and swallow whole their soft invertebrate prey, such as slugs, hairless caterpillars and other insects, spiders and earthworms.[6] Snails are usually avoided, except when they are still very young and the shell can be broken easily.

Protected status[edit]

They are protected in the United Kingdom and Poland.


Subfamily Anguinae


  1. ^
  2. ^ "RSPB - Wildlife Garden A to Z". Retrieved 30 May 2014. 
  3. ^ "Wild about gardens - Slow worm". Retrieved 30 May 2014. 
  4. ^ a b "Wildlife Watch - Beast of the month". Retrieved 30 May 2014. 
  5. ^ a b c "The Wildlife Trusts - Slow worm". Retrieved 30 May 2014. 
  6. ^ "RSPB - Ask an expert". Retrieved 30 May 2014. 
  7. ^ - Anguis cephalonnica
  8. ^

External links[edit]