Earthworms don't have lungs

Earthworms breathe through their skin. Oxygen combines with mucus on the outside of the worm and then enters the worm's blood vessels. The skin has to be wet in order for the oxygen to enter, but not too wet.

If the worm is too dry then it will die, if it is too wet then it cannot absorb the oxygen and then suffocates, and dies. Very sad. This is why whenever it rains the sidewalk is covered with earthworms -- watch your step!!

For more information on earthworms, click here.