DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Plate from 18th century encyclopedia showing illustrations of aquatic worms and flies, and catapillars. Aquatic worms, just like earthworms, are hermaphrodites. This means there's not really a male or female. When aquatic worms mate, each worm is then able to lay eggs. Aquatic worms lay eggs inside small cocoons in the mud, on rocks, or on plants. Eggs are usually laid in late Summer or early Fall.
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