Earthworm Love Is Cuddly ... and Complicated | Deep Look
Earthworms know a thing or two about romance. They cozy up with a mate inside tubes of slime, then follow a series of intricate steps to make cocoons full of baby worms.
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You can tell an earthworm is ready to mate once it has grown a fleshy patch called a clitellum.
When it sidles up to another earthworm, their bodies point in opposite directions, and the worms surround each other with tubes of slime exuded from their skin.
The earthworms embrace by using flaps on their clitella, and exchange sperm that travels outside their bodies. As they snuggle, the sperm flows into internal storage sacs.
After mating, an earthworm produces a sheath with
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