Anguis

Anguis: The Slow Worm Genus

Anguis, commonly known as slow worms, represents a genus of snake-like, legless lizards belonging to the family Anguidae. These reptiles are often mistaken for snakes due to their limbless appearance, but they possess distinct reptilian characteristics such as eyelids and small ear openings, which snakes lack. The genus encompasses five living species, including the well-known common slow worm (Anguis fragilis), the eastern slow worm (Anguis colchica), the Greek slow worm (Anguis graeca), the Peloponnese slow worm (Anguis cephalonnica), and the Italian slow worm (Anguis veronensis), with several fossil species also documented.

Description and Morphology

Slow worms typically exhibit a grey-brown coloration. Females often display a distinctive coppery sheen and two lateral black stripes, while males are known for their electric blue spots, particularly noticeable during the breeding season. A remarkable defense mechanism employed by slow worms is caudal autotomy, the ability to shed their tails when threatened by predators or handled too roughly; the tail, which constitutes about half of their total length, eventually regrows but never to its original size. Morphologically, they can be differentiated from snakes by their movable eyelids, small external ear openings, and a notched tongue, contrasting with the forked tongues of snakes. They reproduce by giving birth to live young, which are born approximately 4 cm long and usually feature golden stripes.

Habitat and Diet

These lizards thrive in a variety of habitats that offer warmth and protection, including woodlands, grasslands, and heathlands. They are also frequently found in garden compost heaps, sometimes intentionally introduced for pest control. Their geographic distribution spans across most of Europe and extends into parts of Asia, with a preference for temperate and humid environments. Slow worms are primarily insectivorous, with a diet consisting of soft invertebrates such as slugs, hairless caterpillars, other insects, spiders, and earthworms. They generally avoid snails unless the prey is very young and its shell can be easily crushed.

Behavior and Lifespan

Slow worms are characterized by their slow movement, which can make them vulnerable. They hibernate from October through February or March, engaging in both communal and solitary hibernation, and sometimes sharing hibernating sites with other reptile species. The average lifespan of a slow worm in the wild is up to 30 years, with a recorded maximum of 54 years in captivity, highlighting their longevity.

Conservation

Several countries, including the United Kingdom, Poland, Croatia, and Slovakia, provide legal protection for slow worms, underscoring their ecological importance and the need for conservation efforts.