• A glowworm is not a worm.
• The light from a glowworm comes from an area on the sides of its stomach. Fatty tissue located there contains air tubes and nerves that when stimulated give off oxygen. The oxygen combines with a pigment in the fat called luciferin, producing the familiar heatless light.
• The glowworm only glows when it's looking for a mate.
• A typical ice worm is a quarter-inch long.
• Nobody knows what an ice worm eats.
• The quality of a silkworm's silk depends on which mulberry leaves it eats. White mulberry leaves make the finest.
• It takes about 110 silkworm cocoons for enough silk to make a tie.
• The mulberry silkworm spins single threads up to 3,900 feet long.
• The silkworm eats continuously for twenty-six days. Then it stops eating and spins its cocoon.
• Almost all silkworms are now domesticated and "employed" in silk production.
• The longest worms—ribbon worms—are named for their flat, ribbon-shaped bodies. They far exceed any other kind of worm in length...some have topped 100 feet.
• The longest worm and the longest animal, end to end, ever found was a ribbon worm that washed ashore in Scotland in 1864. It measured more than 180 feet.

See related factoids about earthworms.