Nightcrawlers are large, earth-dwelling worms commonly found in soil. They are known for their ability to burrow deep into the ground, which helps aerate the soil and improve its quality. Nightcrawlers are often used as bait for fishing due to their size and movement, making them attractive to various fish species. These worms are typically active at night, hence the name "nightcrawlers." They feed on organic matter, such as decaying leaves and plant material, which they break down and recycle into the soil. This process is essential for maintaining healthy ecosystems and supporting plant growth.