Worms

Earthworms have no lungs and no eyes. They breathe through their moist skin, which is one reason they stay underground and come up after rain. As they tunnel, they eat soil and dead leaves and leave behind rich castings that feed plants, while their burrows let air and water reach roots. Charles Darwin was so impressed that he wrote a whole book about them.

Learn what worms eat, how worms reproduce, and how to turn kitchen scraps into compost with worm composting. Teachers will find ready-made worm lesson plans, and aquarium keepers can read about blood worms as fish food.