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

Nick Upton / Slow worm (Anguis fragilis) moving through coastal grassland, flicking its tongue to pick up scents, Cornwall, UK, May.

Nick Upton / Slow worm (Anguis fragilis) sunning on a lichen covered boulder on coastal clifftop grassland, Cornwall, UK, May.

Dave Bevan / Slow worm (Anguis fragilis) basking before moving into cover, Carmarthenshire, Wales, UK. September.

Nick Upton / Slow worm (Anguis fragilis) basking on a garden wall, Wiltshire, UK, July.

Nick Upton / Slow worm (Anguis fragilis) on the move over a garden wall, Wiltshire, UK, July.

Robin Chittenden / Slow worm (Anguis fragilis) crawling along grass, Norfolk UK April

Robin Chittenden / Slow worm (Anguis fragilis) head profile, Norfolk UK April

Robin Chittenden / Slow worm (Anguis fragilis) head profile, Norfolk UK April

Barry Mansell / Florida worm lizard (Rhineura floridana) Florida ,USA, February.

Stephen Dalton / Mediterranean worm lizard (Blanus cinereus) head portrait, Extremadura, Spain

Stephen Dalton / Mediterranean worm lizard (Blanus cinereus) Extremadura, Spain