Close-up of a slow-worm (Anguis fragilis) found resting under a corrugated iron sheet in a limestone habitat . The slow-worm is a species of legless lizard and one of the six species of native reptiles found in the UK. Adult slow-worms can grow up to 40 cm mainly feeding in slugs and worms often being found in compost heaps. Photographed in Somerset, UK, in April.