Maybe it's the way that they move so slowly. Possibly it's the fact that they're not really worms at all. Most likely it's the way that their bottoms light up at night. Whatever the attraction, even people without the slightest affinity for creepy-crawlies seem to find glow-worms fascinating.
Glow-worms are active right now. During the day you might get lucky and find one, but it's after dark when they're much easier to spot. When the female beetles switch on their little green tail lights in order to attract the low-flying males.
The best time to see them glowing is after ten thirty - when it's good and dark. See if you can spot any around your local patch. Choose a warm evening and take a torch with you to get a better view.
Numbers of these curious little creatures seem to be declining which is why we've been surveying the species for over 10 years. Feel free to join in this years Glow-worm survey