Robert Valentic / European legless lizard (Pseudopus apodus thracius) male in a forest clearing in the Dadia Forest, Thrace district , Greece, August. Controlled conditions.

Robert Valentic / European legless lizard (Pseudopus apodus) on rock amongst Poppy (Papaver rhoeas) flowers. Near Evros River, Loutros, Evros, East Macedonia and Thrace, Greece.

Fabio Pupin / European glass lizard, (Pseudopus apodus), Croatia, April . Non-ex.

Fabio Pupin / Italian slow worm, (Anguis veronensis), Italy, June . Non-ex.

Fabio Pupin / European glass lizard, (Pseudopus apodus), Croatia, April . Non-ex.

Fabio Pupin / Slow worm, (Anguis colchica) Romania, July . Non-ex.

Kerstin Hinze / Slow worm (Anguis fragilis) sensing, flicking its tongue, Bavarian Forest National Park, Germany. August.

Philippe Clement / Close-up of a male Slow worm (Anguis fragilis), smelling with tongue, Luxembourg, April.

Nick Upton / Slow worm (Anguis fragilis) on coastal clifftop grassland. Cornwall, England, UK. May.

Dave Bevan / Pair of Slow worms (Anguis fragilis) exposed when roofing felt is lifted, Carmarthenshire, Wales, UK, May.

Brian Bevan / Scheltopusiks (Pseudopus apodus) feeding on locust, UK. Captive, native to Europe and Central Asia.

Nick Upton / Slow worm (Anguis fragilis) on coastal grassland, Cornwall, UK, May.