Earthworm Characteristics

By Amber Kelsey
boy holding earthworm
chris148/iStock/Getty Images

Earthworms (Lumbricus terrestris) are soft-bodied, segmented worms that belong to the Annelida phylum. Earthworms are also called nightcrawlers because they burrow down in the ground during the day and come above ground at night to feed.


maria gritcai/iStock/Getty Images

Earthworms are invertebrates, meaning they don't have backbones. Most earthworms appear pink, brown or red in color.


Carlo Fiumana/iStock/Getty Images

While most earthworm species grow to be only a few inches long, some earthworms grow to a snake-like 22 feet. The longest earthworms live in Australia and South Africa.


jlmcloughlin/iStock/Getty Images

An earthworm has a small brain, a digestive system, a reproductive system and a circulatory system with five pairs of hearts. Earthworms breathe through their skin instead of with lungs.


Carlo Fiumana/iStock/Getty Images

Earthworms are hermaphrodites, meaning they possess both female and male reproductive systems. Mating earthworms lie together and pass sperm to one other.


Vinicius Tupinamba/Hemera/Getty Images

Earthworms are terrestrial worms that like to live in moist soil and leaf litter. Earthworms don't live in regions with permafrost, deserts or permanent ice and snow.

Fun Facts

afhunta/iStock/Getty Images

There are about 2,700 earthworm species in the world.