The largest species measure many feet or meters long, while the smallest worm cannot be seen without a microscope. Many worms eat small plants and animals, others feed on decaying matter. Still other types of worms live as parasites in various animals and plants causing a number of diseases. Most types of worms have a well-developed sense of touch. They also have specialized organs that respond to chemicals in their surroundings.
Many species have a sense of sight, with eyes or eyespots on the head.
People mistakenly believe that caterpillars and grubs are worms. The study of worms is helminthology. Lots of good worm information, especially for worm composting and farming. At this site you meet 'Mary the Worm Woman', investigate worms as recyclers, and learn all about earthworms and their cousins with your host, Wendell. Go to Wiggles the Worm Puzzles and Games .