What do pregnant earth worms look like they look like in their butt there are eggs?

Pregnant earthworms, or mature earthworms ready to lay eggs, can be identified by a swollen segment called the clitellum, which is usually a lighter color. This clitellum produces a mucus ring that holds the fertilized eggs after mating. As the earthworm moves, it deposits these eggs into the ring, which eventually hardens into a cocoon. The eggs are typically small, round, and can be seen within the cocoon, giving the appearance of being "in their butt."