Glow-worms are a species of dragon from the How to Train Your Dragon books by Cressida Cowell. They are primarlly featured in "A Hero's Guide to Deadly Dragons".
COLOURS: Grey in daytime, light in night-time
SIZE: Very small
POISON: None... 0
RADAR: None... 0
ELECTRICITY: None... 0
DEFENCES: None... 0
SPEED AND FEAR AND FIGHT FACTOR: None... 0
The Glow-worm is a tiny creature, more like a worm than an actual dragon. These animals are a useful source of light on moonless nights, or in caves. Sometimes the Vikings even put them in lanterns.