Earthworms may look wriggly and strange, but they play a very important role in keeping our Earth healthy. Their work is so crucial that we celebrate World Earthworm Day every year on 21st October. Earthworms are known as nature’s soil engineers. Almost everything they do helps make the soil better. There are more than 6,000 species of earthworms in the world! Some of these earthworms can live up to 8 years. You can find them on every continent except Antarctica (the South Pole). One of the amaz